Metacaulk Pipe Collars are prefabricated for open/closed through-penetration firestop systems with 11/2-6" (38 - 152 mm) plastic pipe. Easy lock mechanism assures easy install. Collar design greatly cuts time/expense compared to competitors' collars. Used to seal off plastic pipe both in closed & vented (DWV) conditions. Collar may be used on up to 3 hour rated concrete floors and walls, up to 2 hour rated gypsum walls and up to 2 hour rated wood floors. Metacaulk Intumescent Collars