Superb Wrench SPBW-8 Metal Water Filter Housing Wrench For 20-Inch Big Blue Whole House Water Filters Fits #20 big blue whole house water filters. 6 notches. Replaces the plastic SW-4 wrench. Inside diameter 6" inches Fits the following housings: American Plumber W2010-PR / 152015/ W2015-PR / 152017 / 152022 / 144368, Pentek 150237 / 150239 /150469, Pentek BBFS-22, Pentek 144368, Ametek Kleen-Plus 144368, Culligan 144368, Keystone, Whirlpool WHKF-DWHBB Handle is rubberized, and longer than a standard filter wrench. This gives extra leverage. Handle is also imprinted with a directional arrow to ensure proper removal of the housing unit. Made in the USA.