Replacement Air Compressor Pumps: Single & Two Stage

CompressorPros carries replacement air compressor pumps to replace on an existing unit without buying a whole new machine. This category serves shop owners, maintenance techs, and facility managers matching a new pump to their compressor's horsepower, stage, and CFM. Browse single stage and two stage pumps across leading brands, all shipping free, direct from the manufacturer. CompressorPros sells replacement pumps for the brands we carry and can help get something close if your exact pump is no longer available.

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What Are Replacement Air Compressor Pumps?

A replacement air compressor pump is the compression component that mounts to your existing motor, tank, and frame, letting you restore a worn or failed unit instead of replacing the entire machine. Shop owners and maintenance techs turn to a replacement pump when the original has lost efficiency, developed a knock, or reached the end of its service life. CompressorPros carries replacement pumps for the brands we carry including both single stage and two stage pumps, including popular fits like the C-Aire Chinook K 30 and the BelAire and Chicago Pneumatic T39.

Single Stage vs. Two Stage Pumps

The most important split in this category is between single stage and two stage pumps, and it comes down to how the air is compressed and the pressure the pump can reach.

A single stage pump compresses air to its final pressure in one piston stroke, typically topping out around 125 to 135 psi. These are well-suited to smaller shops, lighter duty cycles, and lower horsepower units. A two stage pump compresses air in two steps, reaching higher pressures near 175 psi and generally supporting heavier work at higher CFM.

Types of Replacement Air Compressor Pumps

Single Stage Pumps

Single stage pumps are the more economical option, built for intermittent use and lower pressure demand. They fit smaller reciprocating compressors and light-duty shop work. The Jenny 1 to 2 HP Single Stage Model KU is an example of this group, and the Mi-T-M Single Stage Replacement Pump 3-0303 is a common direct-replacement fit.

Two Stage Cast Iron Pumps

Two stage pumps handle higher pressures and heavier duty cycles, making them a strong choice for applications where higher CFM and pressure are needed . The C-Aire W95II 7.5 HP Two Stage Pump and the Schulz MSV 40 MAX 10 HP Cast Iron Pump sit at the more industrial end of the range.

Brand-Matched Replacement Pumps

Many buyers source a pump by the compressor brand to simplify fitment. CompressorPros carries brand-specific pump lines including Jenny, C-Aire, Quincy, Industrial Gold, and Schulz pumps. Sourcing by brand and model is often the surest way to match the mounting pattern, pulley, and connection points.

Key Specifications To Match

Horsepower (HP) range: The pump must be rated to work with your existing motor. Since HP ranges can vary, it is best to also know the amperage of your motor.
Stage (single vs. two): Determines maximum pressure and duty capability. Match to your working pressure needs.
CFM output: Sets how much air the pump delivers. It should meet the demand of the tools or process the compressor supplies.
Mounting pattern and pulley: Physical fit to your frame, motor, and belt drive. Buying a different pump than the original will mean new bolt pattern, new discharge and likely belt and motor pulley change.

Because a replacement pump has to integrate with equipment you already own, confirm HP, stage, CFM, and mounting against your current unit's specs or manual before ordering. When you are unsure, please reach out.

Frequently Asked Questions

How do I know which replacement pump fits my compressor?
With the model and serial number, we can help determine if we carry an exact match, if we can help find one that is close. Sourcing by your compressor's brand and model is the simplest way to confirm the connection points line up.

Can I put a two stage pump on a single stage compressor?
No. Typically, the motor strength will now be sufficient to drive a two stage.

Is replacing the pump cheaper than buying a new compressor?
Often, yes, since a replacement pump reuses your existing motor, tank, and frame. Whether it makes sense depends on the condition of the rest of the unit, so weigh the pump cost against the age of the surrounding components.

What is the most common mistake when buying a replacement pump?
Focusing on HP alone and overlooking the mounting pattern, pulley, and CFM. A pump can match your horsepower and still fail to fit the frame or meet your air demand, so verify all four specs.

How long does an air compressor pump last?
Service life varies widely with duty cycle and maintenance. Regular oil changes and clean intake filtration are the biggest factors in getting full life from a pump.

Shop Replacement Air Compressor Pumps at CompressorPros

CompressorPros carries replacement air compressor pumps single stage and two stage. Matching HP, stage, CFM, and mounting keeps the swap straightforward. All orders ship free, direct from the manufacturer, and our team can help you confirm the right pump for your compressor.

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Replacement Air Compressor Pumps

BelAire and Chicago Pneumatic T39 (1312101036) 5-7.5 HP Air Compressor Pump

BelAire and Chicago Pneumatic Cast Iron Air Compressor Pump C2 1312202700 7.5 - 10 HP

PAT24 1 - 2 HP Single Stage Air Compressor Pump

PAT38 2 -3.5 HP Single Stage Air Compressor Pump

C-Aire W95II 7.5 HP Two Stage Air Compressor Pump 27 CFM for 7.5 and 10 HP C-Aire Compressors

Cast Iron Air Compressor Pump C1 1312202800 5 - 7.5 HP With Aftercooler

Jenny 1 to 2 HP Single Stage Model K Air Compressor Pump

C-Aire PM F 25A-K Air Compressor Pump

Quincy QT-2 Basic Two Stage 10 and 15 HP Air Compressor Pump - 2020040401 - No Head Unloaders

Jenny 1/3 to 1 HP Single Stage Model F Air Compressor Pump

Jenny 1 to 2 HP Single Stage Model KU Air Compressor Pump

Jenny 1.5 - 5 HP Two Stage Model GT Air Compressor Pump