This is not POM material! Its wear resistance is 6 times that of POM material.
Pulled the trigger 60,000 times, and the side seal was only about 0.01 inch worn.
The improved 249990 side seal has the same super wear resistance as Stainless Steel and better sealing to keep the fluid HOUSING clean.
This Side Seal does not wear the Mix Chamber and avoids the high cost of replacing the Mix Chamber.