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CompAir A11911874 is the control cylinder piston inside the intake valve that opens and closes the valve when the compressor loads and unloads. It is used on CompAir rotary screw air compressors. This aftermarket version is made to the same mounting and connections as the original, so it fits where the old one came off.
Sold as one unit. Check the number on your old part, or in the parts manual for your machine, before ordering.
| Part Type | Intake Valve Cylinder Piston |
| Replaces | CompAir A11911874 |
| Type | Machined steel control piston with seal ring |
| Supplied as | Piston and seal |
| Supplier code | A11911874TD |
| Condition | New, aftermarket |
| Stat. HS-Code | 848180 |
| CompAir Part No.(SPM Part No.) |
|---|
| A11911874(SPM-ACP-2771) |
Compressor will not load or unload
If the compressor builds no pressure on load, or keeps pumping when it should unload, the intake valve is usually sticking. Worn pistons, seals and springs are the usual cause.
Oil blowing back through the air filter
A worn intake valve check plate or seal lets oil mist blow back into the intake when the machine stops. Fix it before the air filter is soaked.
Slow loading and air leaks
Worn seals on the control piston let control air leak past, so the valve opens slowly and the machine wastes energy.
Fitting tips
Isolate and vent the compressor first. Mark the valve position, clean the bore, lightly lubricate the new seals with compressor oil and check the valve opens and closes freely before refitting.
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller | Price | Checked |
|---|---|---|
| eBay, aftermarket seller | USD 260.96 | 6 Oct 2026 |
| Spare Part Mart | USD 208.77 | Today |
Our price of USD 208.77 is approximately 20% less than this seller.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
No. It is an aftermarket part made to fit in place of CompAir A11911874. It is not made by or affiliated with CompAir; the CompAir part number is used only to show what it replaces.
It fits machines that take CompAir A11911874. Machines change parts between serial number ranges, so check the number on your old part or in your parts manual.
It is made to the same mounting and connections as the original part. Fit new gaskets and seals where they are used, and check for leaks and correct operation before putting the machine back to work.
Yes, we ship worldwide. Shipping is calculated at checkout, and every order is covered by our 30 day money back guarantee and price beat guarantee.
Prices depend on your postcode.
In USD for the quantity selected. The exact cost is confirmed at checkout.
