Note: Easy-Lock Fittings are designed to be used only with Easy-Lock hose (or equivalent "Lock-On" type hose.Easy Lock Brass Hose Fittings, Connectors, 3/8 Inch Push-Lock Barb x 3/8 Inch Swivel Female NPT End The special design of the barb allows it to be secured to Easy-Lock or equivalent hose without using ferrules or hose clamps..