RINA-approved exhaust hose, internal Ø 127 mm (roll 20 metres) (price per metre) Ordering possible for sizes smaller than roll (subject to stock availability) The rubber exhaust hose is the most flexible hose available, because of the large number of spiral turns and the smooth EPDM rubber. The completely smooth internal surface of the hose will reduce back pressure in the engine. Exhaust hoses with an internal diameter up to Ø 152mm have a bending radius of 1.5 x the diameter. Exhaust hoses with an internal diameter of more than Ø 152mm have a bending radius of twice the diameter. Temperature resistant between -30º + 100ºC with brief temperatures of 115ºC.