Three Big Blue Housing Mounting Bracket Information: Triple housing mounting bracket for three Big Blue whole house housings Mounts three Big Blue whole house water filter housings to the wall The triple housing bracket can be used with #10 Big Blue whole house housings and #20 Big Blue whole house housings. Replaces the need for three separate WB-SS housing brackets Screws are not included. The screws needed are coarse wood lags. The screws have a 1-1/4 inch length screw body. Installation requires a half inch nut driver.