Stainless steel twin ferrule fittings have been designed for high pressures, vacuums and where vibration is inherent.These fittings are precisely machined to close tolerances. Manufactured in the UK by a BS EN ISO 9001:2008 registered company. The imperial compression sizes given below refer to the size (outside diameter) of the tube which accepts the fitting. Maximum working pressure range @ 30°C : up to 1/4" 400 bar, 3/8" - 1/2" 375 bar, 3/4" 250 bar, 1" 180 bar. These fittings are generally known as DIN 2353 single ferrule fittings and they are designed for use with stainless steel tubes. Ideal for installations where secure leak proof joints are essential. Manufactured in the UK by a BS EN ISO 9001:2008 registered company. The metric compression sizes given below refer to the size (outside diameter) of the tube which accepts the fitting. Maximum working pressure range @ 30°C : 6 - 12 mm 250 bar, 15 - 22 mm 160 bar, 28 - 42 mm 100 bar.