Silicone CAC Hose HOT,High Temp 4-ply Aramid Reinforced,4-1/2" - 5" ID,6" Long HPS 4.5" - 5" (114mm - 127mm) 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.