KleenWater PWF45W Water Filter Housing Wrench For Aqua-Pure AP801 AP802, Pentek Big Blue, Big Clear, YTB, Atlas Filtri and Other Wide Body Filters Compatible with most water filter housings which accept 4.5 inch width filter cartridges (Wide Body) Inside dimension 6 1/8 inch, outside dimension 7.5 inch - made in Italy Compatible with: Pentek Big Blue, Big Clear, Atlas Filtri, YTB Culligan HD-950, Pentair, 3M Aqua-Pure AP801 and AP802