Holdrite HydroFlame Firestop Pro 7 in. x 7 in. Intumescent Putty Pad HF-PP-1

HydroFlame putty pads are a fire-rated, flexible, one-part, intumescent fire stop solution for wall openings and gas through penetrations. When exposed to heat, the putty pad will expand, preventing the spread of fire, smoke, and toxic gases caused by fire. No mixing is required and can be applied by hand to plastic/metal electrical outlet boxes, electrical conduits, insulated pipes, and metal pipe penetrations.