6mm barb is for 1/4" inner diameter hose. 40mm (1.575") 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..
