https://usmadesupply.com/prepare-maintain/specialty-sealants-caulks/usms-marketplace/products/everkem-intumescent-firestop-collars
Everkem Intumescent Firestop Collars | US Made Supply
Everkem Intumescent Firestop Collars protect plastic pipe and conduit penetrations through fire-rated wall and floor assemblies. The intumescent compound...
firestop collarsus madeintumescentsupply