Trident Marine 4" ID Blue Silicone Molded Wet Exhaust Hump w/4 T-Bolt Clamp [270V4000-S/S]4" ID Blue Silicone Molded Wet Exhaust Hump with 4 T Bolt Clamp This silicone and rubber hump hose provides the ultimate flexible connector for marine wet exhaust systems. The hump hose offers much greater tolerance to heat, misalignment, engine movement, and vibration, with significant savings in cost, parts, labor, and space. Construction: Tube & Cover: VHT blue silicone Color: Blue Reinforcement: EPDM Silicone Rubber Temperature Range: 350F (177C)