Unique HOLDRITE HydroFlame firestop systems, the UL Listed water, smoke and firestop product systems provide a water seal for unwanted water intrusion while still protecting against the spread of fire, smoke and gases. Also, available are water dam and water module accessories for added water-tight requirements, the novel design of the HOLDRITE HydroFlame Pro Series transforms how cast-in-place firestop solutions are installed, the patented telescoping design eliminates the need to cut sleeves on the jobsite and the locator whiskers take the hassle out of finding buried sleeves after a concrete pour, the integrated threaded cap allows for easy non-destructive removal and meets OSHA hole cover requirements. Material: Polypropylene.