Metacaulk Pipe Collars Metacaulk® Pipe Collars are prefabricated for open and closed through-penetration firestop systems using 1 1/2″(38 mm) to 6″ (152 mm) plastic pipe. Technical Data Sheet : English Category: Metacaulk Related products MetacaulkMetacaulk MC 150+ Read more MetacaulkMetacaulk Firestop Pillows Read more MetacaulkMetacaulk BlazeSeal Read more