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20mm barb is compatible with 7/9" inner diameter hose 30mm (1.181") flange. Join the flange end with a gasket and secure with a clamp Made of stainless steel 304 for resistance to corrosion and high temperatures. Barbed fitting for a tight seal on hoses when used with a hose clamp (not included). They are commonly used to make connections between ISO-KF fittings and rubber vacuum hoses. widely used in vacuum equipment industry.