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Champion Brass · Air System
322-D
In stock · ships from Knoxville
The 322-D is a manual drain cock used on heavy‑duty truck and trailer air tanks to purge accumulated moisture, oil, and sludge.
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Thread size is inferred from Champion Brass part‑number convention (321D = 1/4″, 322‑D = 3/8″). Verify your tank port size before ordering.
Part data verified against 1 catalog sources
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It uses a needle‑type valve with an external seat, opened and closed by a pull chain or twist handle. With 3/8″ NPT male threads, it screws directly into the tank’s lowest port for complete draining, helping to prevent corrosion, freezing, and air system contamination.
Part Number: 322-D
DRAIN COCKS
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside air system
