Description
It’s made from Viton, a high-performance synthetic rubber. Viton is perfect for this job. It doesn’t swell or break down when it’s in constant contact with oil. It also handles the heat inside a running pump very well.
This means the seal stays reliable for a long time. It won’t degrade and cause a surprise leak.
Replacing this gasket (Part# 300050) is a standard part of pump maintenance. When you change your oil or service the oil box, putting in a fresh, Viton gasket is the best way to ensure a clean, leak-free seal for the next run cycle.

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