Becker U4.20 pump sealed tight with this Dowty seal. It measures 18.5 mm outer diameter, 11.8 mm inner diameter, and 1.5 mm thick. A Dowty seal is a special type of washer that combines a metal ring with a rubber insert. It creates a leak-proof seal on threaded connections. Designed specifically for the Becker U4.20 pump.
This Dowty Seal, 18. 5 x 11. 8 x 1. 5 mm is used on Becker brand of U Series family’s U4. 20 pump models.
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