Bio Fireshield 66455 Biostop Fire-Rated 3" Pipe Collar - Case of 6 Saves on Labor Cost, Easy Installation, Economical No Measurement of MaterialRequired Highly Intumescent Tested for PVC, CPVC, ABS andPVC/ABS Foam Core, FRPP, PP Biostop Fire-Rated 3" Pipe Collar - Case of 6