The HPS 3-1/2" - 4" (89mm - 102mm), 7.5" Long High Temp 4-ply Aramid Reinforced Silicone Charge Air Cooler CAC Hose Coupler Hot Side Bellow meets and exceeds SAEJ20 industry standards. This coupler is designed and engineered to provide a secure connection between engine mounted charge air system components. Ideal for handling slight misalignments and isolating vibration between hose ends. It is great for marine and industrial use, custom turbo or intercooler piping fabrication. Technical Specification: Product Type: Silicone Charge Air Cooler CAC Hose Coupler Hot Side Bellow. Temperature Range:- 65 deg. F to + 500 deg. F (260 deg. C). Reinforced Layer: 4-ply aramid. Hose Inside Diameter: 3.5" - 4" (89mm - 102mm). Hose Outside Diameter: 3.9" - 4.41" (99mm - 112mm). Hose Length: 7.5". Number of Rings: 3. Wall Thickness: 5mm (+/- 0.5mm). UV and ozone resistant. Remark: Silicone hose is NOT compatible with fuel or oil. Compatible with Water/Coolant ONLY, Not for Fuel/Oil