Silicone Hose 90 Degree Coupler. These are perfect for finishing off your turbo, intercooler, supercharger or custom intake installation. Treadstone silicone hose couplers are the highest quality silicone connectors you can buy. These silicone hose couplers are specifically design for turbocharged or supercharged applications, and feature a super slick glossy surface that is easy to wipe clean for that show quality look. 3 ply reinforced construction.