Silicone CAC Hose HOT,High Temp 4-ply Reinforced,3-1/2" - 4-1/2" ID,6" Long HPS 3.5" - 4.5" (89mm - 114mm) ID, 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.