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Sealco · Air System
SEA140280
In stock · ships from Knoxville
This is a pressure protection valve for heavy-duty air brake systems.
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Verified fitment for 2 applications
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All confirmed applications for this part number.
Other applications
Other applications
Designed for any commercial vehicle air system requiring a nominal 70 PSI closing pressure and 3/8" NPT ports. Commonly used to protect the primary reservoir and auxiliary air circuits.
Part data verified against 5 catalog sources
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It isolates the primary brake reservoir from auxiliary air devices, closing at 70 PSI to preserve braking function if a downstream leak or failure occurs. The valve includes an internal one-way check valve and filter, and should be installed with the vent facing downward. Replace it when you notice unintended pressure loss from the brake reservoir or the valve fails to close at the correct pressure, ensuring your truck or trailer stays compliant with FMVSS 121.
Part Number: SEA140280
VALVE, PRESS. PROTECTION
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside air system
