LS Steam Tube Kit W/speed Flex LS Steam Tube Kit with Braided Stainless Speed-Seal Hose, Zinc Plated Steel Hose Ends, and Adjustable Steam Vent Adapters for the Front Outlets on the Engine HolleySteam Vent Adapters & kits. They are designed to eliminate trapped air and steam from your engine to prevent hot spots or overheating. The complete kits are available to plumb your Ls engine and include the appropriate hose and hose ends to make installation a breeze. These kits are more attractive than the Oe (Original Equipment) rigid hard lines and provide flexibility when using aftermarket intakes and other accessories on performance vehicles.