PE-75-P02H-WW-30 is a welded polyester filter bag made by Eaton. This SENTINEL bag is 75 micron, size 02, and comes with a polyester sealing ring. The ring snaps into place in the filter housing so it is held in place. Increases in differential pressure activates the sealing lip, preventing bypass during filtration. The polyester construction is resistant to a number of chemicals. The felt is silicone-free and welded together, not sewn. SENTINEL bags use a welded and heat sealing process that makes for no needle holes or loose fibers - all of which contributes to better filtration.