Fire retardant pipe inserts for plumbing supports. The collection includes HoldRite 404-R, 405-R and 406-R fire retardant inserts for 1/2", 3/4" and 1" pipe.
These inserts cushion pipe in supports and help reduce noise and abrasion, and the fire retardant version is intended for areas where combustible materials are restricted, such as return air plenums. Match the insert to the pipe size and to the HoldRite bracket or support it fits. Check local code and the listing for plenum use.
