Holdrite® HydroFlame™ pipe collars are prefabricated for open and closed through penetration firestop systems using 1 -1/2 to 6 in plastic pipe. An easy interlocking tab assures fast and easy installation. The design of the collar greatly reduces the time and expense that is required to install competitive collars. Tested in accordance to ASTM E814 or UL 1479 and CAN/VLC-S115 testing standards.