These 3/8 in push-on and lock-on hose barb couplers have 8 locking balls for better retention of plugs. Specifically designed to fit Milton push-on and lock-on hoses, the P style hose barb coupler requires no clamp or ferrule, simply push fitting into hose. Has a maximum inlet pressure of 300 psi and a basic flow size of 3/8 in .