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 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.