PORTER-CABLE C2004-WK 4-Gallon Air Compressor: Full Guide
The PORTER-CABLE C2004-WK is a compact 4-gallon pancake air compressor designed for contractors, DIY users, finish carpenters, remodelers, and homeowners who need portable compressed air without moving a large shop compressor from place to place.
Its most important characteristics are a 165 PSI maximum tank pressure, an oil-free pump, 2.6 SCFM at 90 PSI, a lightweight 29-pound body, dual air couplers, and an included 25-foot polyurethane air hose. Those specifications make it particularly well suited to pneumatic nailers, staplers, tire inflation, blow guns, and other intermittent air tools.
The C2004-WK is not designed to replace a large high-CFM shop compressor. Its four-gallon tank and moderate airflow mean continuous-demand tools such as air sanders, grinders, and large spray guns can consume air faster than the pump replenishes it.
For its intended applications, however, the combination of high tank pressure, fast recovery, low maintenance, compact dimensions, and easy portability gives the C2004-WK several practical advantages.
This guide covers the PORTER-CABLE C2004-WK’s performance, airflow, tank capacity, noise level, pump design, portability, included hose, pneumatic-tool compatibility, maintenance needs, advantages, disadvantages, and ideal uses.
PORTER-CABLE C2004-WK Specifications
| Specification | PORTER-CABLE C2004-WK |
| Compressor Type | Portable pancake air compressor |
| Tank Capacity | 4 gallons |
| Maximum/Cut-Out Pressure | 165 PSI |
| Cut-In Pressure | 135 PSI |
| Air Delivery at 40 PSI | 3.3 SCFM |
| Air Delivery at 90 PSI | 2.6 SCFM |
| Running Horsepower | 0.8 HP |
| Voltage | 120V |
| Current | 10 amps |
| Pump Type | Oil-free |
| Noise Level | 75.5 dBA |
| Weight | 29 lb |
| Pressure Gauges | 2 |
| Air Couplers | 2 regulated quick-connect couplers |
| Quick Connect | 1/4-inch industrial |
| Included Hose | 25 ft x 1/4 in polyurethane hose |
| Recommended Duty Cycle | 50–75% average |
PORTER-CABLE’s documentation confirms the 4-gallon tank, 135 PSI cut-in pressure, 165 PSI cut-out pressure, 2.6 SCFM at 90 PSI, and 75.5 dBA noise rating. The company’s historical catalog additionally lists 3.3 SCFM at 40 PSI, 0.8 running horsepower, 10-amp current draw, and a 29-pound product weight.
What Is the PORTER-CABLE C2004-WK?
The C2004-WK is an oil-free portable pancake compressor.
A pancake compressor uses a short, wide horizontal tank positioned underneath the motor and pump assembly. This configuration creates a low center of gravity and allows the compressor to fit into a relatively compact footprint.
The WK version distinguishes itself by including a 25-foot x 1/4-inch red polyurethane air hose with factory-installed coupler and plug. PORTER-CABLE described the hose as lightweight, flexible, abrasion resistant, and highly visible.
The machine is aimed primarily at portable pneumatic-tool applications rather than high-volume stationary shop use.
Think of jobs such as:
finish carpentry, trim installation, cabinet work, flooring, molding, punch-list repairs, furniture projects, tire inflation, and general household maintenance.
That is where its combination of portability and compressed-air storage makes the most sense.
165 PSI Maximum Pressure
One of the C2004-WK’s standout specifications is its 165 PSI maximum tank pressure.
According to the owner’s manual, the compressor automatically shuts off at approximately 165 PSI and restarts when tank pressure drops to approximately 135 PSI.
Higher tank pressure does not mean every connected tool should operate at 165 PSI.
Instead, it means the four-gallon receiver can store more compressed air before reaching its cut-out point. The regulator then reduces the outlet pressure to whatever level the connected pneumatic tool requires.
For example, many nailers operate well below maximum tank pressure. Storing air at a higher pressure gives the compressor a larger usable reserve before the motor needs to cycle again.
That is especially helpful with a relatively small 4-gallon tank.
2.6 SCFM at 90 PSI Airflow
When evaluating an air compressor, SCFM is generally more important than maximum PSI for determining which air tools it can operate.
The PORTER-CABLE C2004-WK produces:
3.3 SCFM at 40 PSI
and
2.6 SCFM at 90 PSI.
Those figures place it squarely in the portable fastening and light-duty pneumatic-tool category.
A nail gun only uses a relatively small burst of compressed air each time it fires. Between fasteners, the compressor has time to recover.
That makes the C2004-WK a sensible match for many:
- Brad nailers
- Finish nailers
- Pin nailers
- Staplers
- Selected framing and specialty nailers
- Tire inflators
- Blow guns
Independent jobsite testing reported that the C2004-WK successfully powered two finish nailers simultaneously during trim work and also handled a positive-placement hanger nailer.
That does not mean every pneumatic tool will work equally well.
A tool requiring 6, 8, or 10 SCFM continuously will eventually use compressed air faster than the C2004-WK can replenish it.
4-Gallon Pancake Tank
The 4-gallon tank is intentionally compact.
Tank capacity determines how much compressed air can be stored between pump cycles. A larger tank generally allows an air tool to run longer before tank pressure falls.
The tradeoff is size and weight.
PORTER-CABLE designed the C2004 around portability rather than maximum storage capacity. At only 29 pounds, it is considerably easier to move than many larger contractor compressors.
The four-gallon tank therefore works best with intermittent-demand pneumatic tools.
A finish nailer may fire several nails and then pause while measurements, positioning, or fitting work takes place. Those pauses give the compressor time to recharge.
A pneumatic sander operating continuously provides almost no recovery time.
That difference explains why tank size and SCFM must be considered together.
Oil-Free Pump Requires Less Routine Maintenance
The C2004-WK uses an oil-free compressor pump.
This has several practical benefits.
There is no compressor oil level to monitor, no scheduled pump oil changes, and less risk of oil being spilled while the unit is transported between jobs.
PORTER-CABLE described the pump as maintenance-free in its documentation.
For a portable compressor that may spend significant time riding in a work vehicle, being carried upstairs, or moved around renovation sites, that simplicity is valuable.
An oil-free pump does not mean the compressor requires absolutely no maintenance, however.
The air tank still needs to be drained regularly, fittings should be inspected, the safety valve needs to remain functional, and air leaks should be addressed.
29-Pound Weight Makes It Truly Portable
At approximately 29 pounds, portability is one of the C2004-WK’s strongest characteristics.
PORTER-CABLE designed a large integrated handle into the upper shroud, allowing the compressor to be carried with one hand when necessary.
The shroud also includes cord storage and protects important components such as the pressure gauges and control area.
This makes the compressor particularly useful for contractors who repeatedly move equipment:
from a vehicle to a house,
from one room to another,
or between different floors of a building.
A compressor can have impressive specifications, but if it weighs 60 or 80 pounds, users may hesitate to move it for a small repair.
At 29 pounds, the C2004-WK is far more practical for quick jobs.
75.5 dBA Noise Rating
Air compressors are rarely silent, but the C2004-WK was designed to reduce operating noise compared with many older pancake compressors.
PORTER-CABLE lists a measured sound pressure level of 75.5 dBA under ISO 3744 testing.
An independent reviewer who tested the compressor during indoor finish work also described it as noticeably quieter than older pancake compressors used previously.
That can matter when working inside occupied homes.
A compressor repeatedly cycling on during trim installation can quickly become irritating if it is exceptionally loud.
The C2004-WK is still a power tool, however, and appropriate hearing protection remains sensible where exposure levels or duration warrant it.
Low-Amp 120V Motor
The compressor operates on 120V household power and is rated at approximately 10 amps, with a 15-amp minimum branch circuit specified in the documentation.
PORTER-CABLE promoted the motor as a low-amp design intended to start more easily in colder temperatures and when an appropriate extension cord is required.
That is beneficial on renovation and construction sites, where a dedicated high-capacity power circuit may not always be conveniently located.
As with any compressor, using undersized or excessively long extension cords can cause voltage drop and starting problems. Properly rated electrical connections remain important.
Dual Factory-Installed Air Couplers
The C2004-WK includes two regulated factory-installed quick-connect air couplers.
This makes it possible to leave two hoses or pneumatic tools connected simultaneously.
For finish carpentry, one worker might use a brad nailer while another uses a finish nailer.
Alternatively, a user could keep two different nailers connected and switch between them without repeatedly disconnecting the hose.
The important limitation is airflow.
Two couplers do not double the compressor’s 2.6 SCFM at 90 PSI output.
If both tools demand substantial amounts of air at the same time, tank pressure will drop more quickly.
For intermittent fastening tools, however, dual couplers add useful convenience.
25-Foot Polyurethane Hose
The C2004-WK package includes a 25-foot x 1/4-inch polyurethane hose with the coupler and plug already installed.
Polyurethane hose is well suited to portable applications because it combines relatively low weight with flexibility.
The bright red finish also improves visibility around a work area, which can help make the hose easier to see among tools, lumber, cords, and construction materials.
Twenty-five feet provides enough range for many interior jobs while allowing the compressor itself to remain in one general location.
For larger work areas, additional properly sized hose may be needed.
Is the C2004-WK Good for Nail Guns?
Pneumatic nailers are arguably the ideal application for the PORTER-CABLE C2004-WK.
The 165 PSI tank storage, 2.6 SCFM recovery rate, and four-gallon receiver are well matched to tools that operate in short bursts.
Independent field testing found the unit capable of running two finish nailers during door and window trim work without difficulty.
For trim carpentry, baseboards, crown molding, cabinet installation, furniture construction, and punch-list jobs, this is exactly the type of application for which a small pancake compressor makes sense.
Can the PORTER-CABLE C2004-WK Inflate Tires?
Yes.
The compressor provides far more stored-air capacity than a typical compact tire inflator and can be paired with an appropriate tire chuck and pressure gauge.
It can be useful for car tires, motorcycle tires, trailers, bicycles, lawn equipment, and general garage inflation tasks.
The compressor’s 165 PSI tank rating should not be confused with the correct inflation pressure for a tire.
Always inflate to the vehicle, tire, or equipment manufacturer’s specified pressure and monitor pressure with an accurate gauge.
Can It Run an Impact Wrench?
The answer depends on the impact wrench.
Many full-size pneumatic impact wrenches require more continuous airflow than 2.6 SCFM at 90 PSI.
The C2004-WK may operate certain low-consumption air tools for short bursts using stored tank air, but the four-gallon receiver can empty quickly.
For occasional brief pneumatic-tool use, this may be acceptable.
For regular automotive impact-wrench work, a compressor with higher SCFM and a larger tank is generally a more appropriate choice.
Is It Suitable for Spray Painting?
Small airbrushes or very low-consumption spray equipment may be compatible.
Full-size paint guns are a different matter.
Many automotive and HVLP spray guns require considerably more continuous CFM than the C2004-WK can supply.
The compressor could initially operate such a tool using stored tank air, but pressure would likely fall as the spray gun continues consuming air.
For sustained painting, compressor SCFM should meet or exceed the spray gun’s airflow requirement with reasonable reserve capacity.
Can It Run Sanders or Grinders?
Pneumatic DA sanders, die grinders, and air grinders are generally poor matches for this compressor when used continuously.
These tools often require significantly more than 2.6 SCFM.
PORTER-CABLE’s own troubleshooting guidance states that if an accessory requires more SCFM or pressure than the compressor supplies, a larger compressor is necessary.
This reinforces an important point: the C2004-WK is a strong portable fastening compressor, not a substitute for a large workshop air system.
Recommended Duty Cycle
The owner’s manual says the pump is capable of continuous operation but recommends maintaining an average 50% to 75% duty cycle to extend compressor life.
In practical terms, PORTER-CABLE recommends that the pump operate no more than approximately 30 to 45 minutes during any one-hour period.
If an air tool causes the compressor to run almost continuously, that is a strong indication that the tool’s air demand is too high for this compressor.
Maintenance and Tank Drainage
Although the pump itself is oil-free, the compressor still requires basic maintenance.
The most important task is draining condensation from the air tank.
Compressed atmospheric air produces moisture. If water remains inside a steel receiver, internal corrosion can eventually weaken the tank.
PORTER-CABLE instructs users to drain the tank daily or after each use and warns against drilling, welding, or attempting to repair a damaged receiver tank.
The C2004 uses a ball-style drain valve positioned beneath the tank. An independent review specifically praised the improved valve because it made routine moisture drainage easier than some older compressor drain designs.
For an older second-hand C2004-WK, tank condition should be considered particularly important.
PORTER-CABLE C2004-WK Pros and Cons
| Pros | Cons |
| 165 PSI maximum tank pressure | Four-gallon tank is small for continuous air tools |
| 2.6 SCFM at 90 PSI supports many nailers | Insufficient airflow for many sanders and grinders |
| Only 29 lb | Not intended for high-CFM shop work |
| Oil-free pump reduces maintenance | Tank still requires regular draining |
| Relatively quiet 75.5 dBA rating | Still loud enough to justify hearing protection when appropriate |
| Dual regulated quick couplers | Two demanding tools can exhaust stored air quickly |
| Includes 25-ft polyurethane hose | Older/discontinued model requires checking condition carefully |
| Integrated handle and cord wrap | Limited tank reserve compared with larger compressors |
| Standard 120V operation | Full-size spray guns may exceed available airflow |
Who Is the PORTER-CABLE C2004-WK Best For?
The C2004-WK is best suited to someone prioritizing portability and pneumatic fastening over continuous airflow.
It makes sense for finish carpenters, trim installers, remodelers, cabinet installers, flooring crews, maintenance workers, DIY homeowners, and anyone frequently using nailers or staplers.
Its relatively low weight also makes it appealing for projects where the compressor needs to move repeatedly.
Someone primarily running a large impact wrench, pneumatic grinder, DA sander, sandblaster, or high-consumption spray gun should look toward a substantially larger compressor with higher continuous airflow.
What Should You Check When Buying a Used C2004-WK?
Because the model has been around for many years, the condition of a specific unit matters as much as its original specifications.
Check whether the compressor reaches its approximate 165 PSI cut-out pressure, restarts properly near 135 PSI, holds pressure without excessive leakage, and produces regulated pressure consistently.
Inspect the tank, drain valve, regulator, gauges, quick couplers, power cord, hose, handle, and protective shroud.
Listen for unusual pump or motor noises and check whether the compressor cycles excessively when no air tool is being used, which could indicate leakage.
Most importantly, examine the receiver for serious rust, physical damage, modifications, or evidence of repair.
PORTER-CABLE’s manual specifically warns that air receiver tanks have a finite service life and that corrosion can weaken them.
Frequently Asked Questions About the PORTER-CABLE C2004-WK
How large is the PORTER-CABLE C2004-WK tank?
The compressor uses a 4-gallon pancake-style air tank.
What is the maximum PSI?
Maximum cut-out pressure is approximately 165 PSI, with the compressor restarting near 135 PSI.
How much CFM does the C2004-WK produce?
PORTER-CABLE rates it at 3.3 SCFM at 40 PSI and 2.6 SCFM at 90 PSI.
Is the PORTER-CABLE C2004-WK oil-free?
Yes. It uses an oil-free, maintenance-free pump, so routine compressor-pump oil changes are unnecessary.
How much does it weigh?
The compressor itself weighs approximately 29 pounds.
How loud is the C2004-WK?
Its published sound-pressure rating is approximately 75.5 dBA, tested according to ISO 3744.
Does the C2004-WK come with an air hose?
Yes. The WK package includes a 25-foot x 1/4-inch red polyurethane hose with factory-installed coupler and plug.
Can two nail guns be connected?
Yes. The compressor includes two regulated quick-connect couplers. Both tools still share the same tank and pump capacity.
Is it good for finish carpentry?
Yes. Finish carpentry is one of its strongest applications because finish nailers consume air intermittently, allowing the compressor time to recover. Independent testing successfully used the machine with two finish nailers simultaneously.
Final Thoughts
The PORTER-CABLE C2004-WK 4-gallon air compressor was designed around a sensible combination of high stored pressure, compact dimensions, relatively low noise, low maintenance, and genuine portability.
Its 165 PSI maximum pressure, 2.6 SCFM at 90 PSI, four-gallon tank, oil-free pump, 29-pound weight, dual air couplers, and included 25-foot polyurethane hose make it particularly well suited to finish nailers, brad nailers, staplers, inflation equipment, blow guns, and similar intermittent pneumatic applications.
Its limitations are equally important. A four-gallon tank and 2.6-SCFM output cannot provide the continuous airflow expected by demanding pneumatic sanders, grinders, large spray guns, or other high-consumption equipment.
For trim work, remodeling, punch-list projects, household repairs, tire inflation, and portable pneumatic fastening, however, the C2004-WK offers a useful balance of compressed-air capability and portability.
If considering an older unit today, pay particular attention to air-tank condition, pressure regulation, leaks, drain-valve operation, and whether the compressor reaches its proper cut-in and cut-out pressures. A mechanically sound C2004-WK can still be a practical portable air source when its airflow is correctly matched to the job.