Watertight, factory-manufactured, STI Marine Pipe Collar is an intumescent device for use as a penetration seal in fire-rated bulkheads and decks. Watertight firestop collars are comprised of a stainless-steel body with a mild steel flange for easy weld attachment and lined with a molded, intumescent insert that rapidly expands more than 60X to contain the fire to the point of origin, restricting the passage of fire, smoke, and hot gases. A rubber bushing is integrated into the collar to ensure watertightness. Heavy gauge, chromium rich 316 stainless steel construction Provides watertightness up to 4 bar and gastightness up to 1 bar. Features a watertight rubber grommet rated up to 6 bar Solid design requires pipe to be inserted through the watertight bushing. Flexible intumescent liner accommodates vibration and will not damage pipe Resistant to aging and weathering This listing is for each. Technical Specification Firestop Item Marine Pipe Collar For Pipe Size 5/8 in Firestop Application Metal Pipe, Plastic Pipe Fire Rating Up to 1 hr Height 5/8 in Material Stainless Steel Color Silver Standards Tested to IMO A.754 FTP, American Bureau of Shipping, US Coast Guard, Bureau Veritas, DNV-GL, 1408/14, Class B0-B30, A0-A60, H0-H120 Bulkheads and Decks Item Marine Watertight Firestop Pipe Collar