Jones Stephens 4 in. Cast-Iron Snap-In Strainer for Philadelphia Vent Boxes

This 4 in. Cast-Iron Snap-In Strainer for Philadelphia Vent Boxes features integral cast baffles. Use this strainer as a replacement with a 4 in. inside-caulk Philadelphia-style vent box (sold separately). This strainer secures with an overlapping lug and screw, which are sold separately.