BFR is a secondary rod seal used together with a primary seal to help protecting the main seal component from damages caused by pressure surges and excessive heat buildup.

 NBR O-rings offer excellent sealing and mechanical properties at low cost. Buna Nitrile O-ringshave resistance to common lubricants and are recommended for crude oil, gasoline, propane, petroleum oils and water.  Nitrile Buna O-rings are used in engines, gearboxes, aircraft pumps, and water applications.