Silicone CAC Hose HOT,High Temp 4-ply Aramid Reinforced,2" - 2-1/2" ID,6" Long HPS 2" - 2.5" (51mm - 63mm), 6" 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.