Venair Coupler Silicone Hoses are made of VMQ type silicone tubing with 4-layers of polyester fiber reinforcement (3-layers on ID sizes 1.75” and smaller). A must for forced induction vehicles. The operational temperature range is from -60C to 180C, although it may reach up to 200C during short periods of time. Venair Silicone Hoses does not spoil with age and the mechanical characteristics doesn’t change in its operational temperatures. Highly resistant to ozone and is not affected by anti-freeze or anti-rust liquids. The materials of the tubes have a very long life and reduce maintenance problems.