CAT Pumps 17615 Nitrile O-Ring N-75 - 4644
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The Cat Pumps 17615 is a genuine OEM replacement O-ring made from NBR (nitrile/Buna-N) rubber with a 75 durometer hardness. Nitrile resists water, oils, and many common cleaning solutions, and the 75 durometer compound is slightly firmer than standard 70 durometer O-rings, so it holds its shape and seals reliably under the high pressures found in Cat plunger pumps. The “VPG” in the part description most likely refers to its location, such as the valve plug, where it seals against the manifold to keep water contained under pressure.
O-rings harden, flatten, or crack over time from pressure cycling, heat, and chemical exposure, and they’re often damaged when parts are removed during service. Replacing them whenever you open the pump for valve or seal work helps prevent leaks, pressure loss, and damage to more expensive components. As a genuine Cat part, it’s built for an exact fit.
Key features:
- NBR (nitrile/Buna-N), 75 durometer
- Seals reliably under high pressure
- Resists water, oils, and common cleaning solutions
- Genuine OEM Cat Pumps part for an exact fit