Brand New, never used, Open crate.. ? These are used in residential/ commercial water filters applications for restaurants, ice machines, whole houses ect. Big Blue Filter Wrench included. This Pentair Pentek 150235 Big Blue Filter Housing is designed for heavy-duty use in whole house water filtration. It features a 1-1/2 NPT connection and can hold a #20 filter cartridge. The blue color and Potable Water Filter style make it a stylish and practical addition to any home.