HPS 4" (102mm) 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. Ideal for handling slight misalignments and isolating vibration between hose ends; 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: 4" (102mm). Hose Outside Diameter: 4.45" (113mm). Hose Length: 12". Number of Rings: 6. Wall Thickness: 4.5mm (+/- 0.5mm). UV and ozone resistant. Remark: Silicone hose is NOT compatible with fuel or oil.