HPS 3-3/4" Silicone Hump Coupler Hose features 4-ply reinforced high temperature material, for which meet or exceed SAEJ20 Standard. HPS 3-3/4" silicone hump hoses are made of 4-ply reinforced and knitted premium polyester fabric with high temperature silicone rubber, engineered for extreme temperature and various pressure ranges where high performance levels are required. HPS 3-3/4" inch 4-ply Reinforced Silicone Hump Straight Coupler Hose allow for expansion, movement, and extreme vibration between two hard pipes while reducing the possibility of connections coming apart or having your hard pipes or other equipment break. HPS 3-3/4" inch Silicon Hump Coupling Hoses are used by professionals in industries such as high performance racing vehicles, commercial truck and bus, Marine, agricultural and off highway vehicles, turbo diesel, food and beverage, and general manufacturing industries.