3M™ fire barrier RC-1 restricting collar works with our 3M™ fire barrier wrap strip FS-195+ or ultra GS firestops for through penetrations in wall, floor and floor/ceiling assemblies. Durable 28 ga steel collar is easily cut to fit the pipe diameter. The collar secures the firestop and provides tabs for anchoring to walls or floor slabs, helping ensure stability for effective firestops. With its small but critical design features, our 3M™ fire barrier RC-1 restricting collar is integral to successful intumescent firestop installation around penetrations in wall, floor and floor/ceiling assemblies. Quite simply, it's a crucial component for ensuring that elastomeric and hard char firestop material will properly close openings left by burned non-metallic pipes and other penetrations. In fact, the use of such a collar is required for firestopping plastic pipes larger than 4 in Dia. The fire barrier RC-1 is ideal for use in conjunction with 3M™ fire barrier wrap strip FS-195+ or 3M™ fire barrier ultra GS firestops. Durable 28 ga steel is thin enough for installers to easily unroll and cut to size around the installed firestop. It is quickly secured into place with a hose clamp or steel tie wire. Notches in its outer edge of the RC-1 restricting collar form bendable tabs - installers simply bend them into place and use hardware such as masonry fasteners (sold separately) to anchor them to the floor or ceiling slab. The result is a permanent, fixed firestop that also contributes to the structural stability of the penetration.