Silicone CAC Hump Hose HOT,High Temp 4-ply Aramid Reinforced,3-1/2" ID,12" Long HPS 3-1/2" (89mm) x 12" Long High Temp 4-ply Aramid Reinforced Silicone Charge Air Cooler CAC Hose Coupler Hot Side Bellow meet and exceed SAEJ20 industry standards, designed and engineered to provide a connection between engine mounted charge air system components.