Size:40mmWhat is this?Brass thread fitting mainly used for pipe connection, suit for connecting hoses, gas pipes, air pipes, pneumatic hoses, widely used in industrial equipment and homesAre there any advantages of the product?Hex connectors are made of brass, which is corrosion-resistant, high strength, and long service life. It has good sealing performance and is not easy to slip, which can make the connection of pipe fittings tighter.How to use it?1. Remove the old brass fittings2. Put on the new pipe connector and connect the hose.What should I notice?All size above is measured by manual, please allow +/-0.1 inch error.