CAT Pumps 17617 Buna-N Valve Plug O-Ring - 5149
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The Cat Pumps 17617 is a genuine OEM replacement O-ring for the valve plugs on Cat plunger pumps. The valve plug threads into the pump manifold over each valve chamber, and this O-ring seals it so high-pressure water stays contained. Because the plugs come out every time the valves are inspected or replaced, these O-rings often get nicked, flattened, or hardened during service. That leads to seepage around the plug, pressure loss, and in some cases erosion of the manifold. Fitting a fresh O-ring at every valve job keeps the seal tight.
It’s made from Buna-N (nitrile) rubber with a 90 durometer hardness. That’s a very firm compound that resists extrusion under high pressure better than standard 70 durometer O-rings, which suits this high-load sealing location.
Key features:
- Valve plug O-ring for Cat plunger pumps
- Buna-N (NBR), 90 durometer for high-pressure sealing
- Resists extrusion and holds its shape under load
- Prevents leaks and pressure loss around valve plugs
- Genuine OEM Cat Pumps part