PH Series hydraulic quick-connect couplings include a pressure relief feature on the poppet valve that allows connection under pressure. These couplers and nipples allow connection with H Series valved couplers and nipples when there is a residual pressure on the PH coupler/nipple side. Sleeve is manually operated for a secure connection. These couplers can be mated with H and IH Series couplings for a variety of configurations and uses.