Bag Filter Housings for the Pentek BP-410-5 Filter Bag: The Pentek BP-410-5 155385-03 bag filter fits in bag filter housing assemblies for 4" W x 8-5/8" L bag filters. Use the Pentek PBH-410-1 1" Inlet/Outlet Bag Filter Vessel Water Filter System. Use the Pentek PBH-410-1.5 1.5" Inlet/Outlet Bag Filter Vessel Water Filter System. . . ( Case of 12 items for one low shipping cost )