Blue Silicone 350F CAC Reducer Hose, 2.50 x 2.00" ID, 6" L 30005 This size has a 40mm

This size has a 40mm (1 9/16") ID

This size can conform to gentle bends with a 5

The 16mm ID at one end and 13mm ID at the other end let you connect a 5/8" OD tube to a 1/2" OD tube

The 4-ply reinforcement results in a 5mm wall thickness (86mm / 3 3/8" and 67mm / 2 5/8" OD) and a working pressure rating over 18 psi (92 psi burst pressure)

Crush the cardboard sleeve to let the clamp slip off

Blue Silicone 350F CAC Reducer Hose, 2.50 x 2.00" ID, 6" L 30005 This size has a 40mmCharge Air Cooler (CAC) hose is specifically designed to handle the higher temperatures and pressures in high performance turbo and supercharged applications. Four layers of polyester reinforcement and 3 reinforcing rings allow operating pressures of 50 psi (199 psi burst pressure) and temperatures up to 350 F (180 C). Note that this temperature rating is best suited to the "cold" (post intercooler) side of the system. This hose is color coded Blue