Which term describes the sealing material used inside spray gun valves to prevent air leaks?

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Inside spray gun valves, the sealing material around the valve stem that stops air leaks is called air valve packing. This packing sits around the moving stem where it passes through the valve and creates a tight seal to prevent air from leaking past the stem as the valve is opened or closed. The packing material is chosen for resistance to solvents and wear, and it compresses to maintain the seal as the valve operates.

An O-ring is a round seal used in grooves around shafts or housings, but the general term described here refers specifically to the packing inside the valve. A gasket is a flat seal placed between two mating surfaces, not the packing around a valve stem. Sealant is a liquid or paste applied to joints or threads to prevent leaks, not the seal used inside the valve itself.