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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