This is a silicone sealing ring (Part # 300093). It is a small round ring made of red or orange silicone. The size is 23.0 mm across the outside, 8.0 mm through the hole, and 3 mm thick .This ring is made specifically for the Becker U4.20 vacuum pump . It is not for bigger pumps like the U4.70 or U4.100. Just the U4.20.This exact same ring (300093) is also part of the Becker Seal & Gasket Kit (Part# 54900040300) for the U4.20 . If you are doing a full rebuild, buying the whole kit might save you money. But if you only need this one ring, buying it is fine.
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