Witten Replacement Automatic Vent Size:16" wide x 8" high above and below the waterline

above and below the waterline

Fits all brands of 1/4' and 3/8' sized cordless drills

Designed for use on doors up to 450 lb

Any changes made to the pre-set pressure is entirely at the risk of the person(s) / company who make the adjustment

c-frame creeper seat

Witten Replacement Automatic Vent Size:16" wide x 8" high above and below the waterlineNo mortar required for installation Easy installation method tighten 4 screws Bi metal coil design allows aluminum louvers to open and close automatically Louvers fully open at 75 and fully closed at 35 Net free air 68 square inches Materials Perma coated screen molded into vent