The 3M plastic pipe device is a one piece metal collar assembly encasing 3M’s heat expanding 3M interamTM Ultra GS (intumescent) material. the 3M plastic pipe device is used for new and retrofit installations and will accommodate 1 1/2 inch (38 mm), 2 inch (5 cm), 3 inch (7 mm), and 4 inch (10 mm) schedule drain, waste and vent pipe system. the 3M plastic pipe device achieved up to 3 hours fire ratings when tested by Underwritters Laboratories, Inc.In acordance with ASTM E 814 (UL1479) .