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The Pentek SW-4 Wrench for 20 Big Blue Housing combines quality and functionality with durability for a lifetime of customer satisfaction. It is well-made from sturdy material that makes it a reliable product.

Wrench Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. SW-4 Big Blue 5 7/8" Water Filter Housing Sump Spanner Wrench. (Big Blue Filter Housings Use A 5 3/4" Diameter O-Ring) Ametek SW4. Only for use in loosening sumps on filter housings, never to tighten. Overtightening may cause damage to the O-rings and make re-opening VERY difficult. Hand tighten Only. For really stubborn filter housings our technicians will use two wrenches together for maximum power where one wrench might break or not do the job. Our pure water techs know the tricks.

Pentek SW-4 Big Blue SW4 Water Filter Housing Sump Spanner Wrench Compatible With Culligan, Ametek, US Filter, Plymouth, Kleen Plus, American Plumber, Bruner & Many Other Brands. SW-4 Big Blue 5 7/8" Water Filter Housing Sump Spanner Wrench. (Big Blue Filter Housings Use A 5 3/4" Diameter O-Ring) Ametek SW4. Only for use in loosening sumps on filter housings, never to tighten. Overtightening may cause damage to the O-rings and make re-opening VERY difficult. Hand tighten Only. For really stubborn filter housings our technicians will use two wrenches together for maximum power where one wrench might break or not do the job. Our pure water techs know the tricks.