The OPW 66V Series breakaways are designed and rigorously tested for use in today’s fuels. Installed on fuel dispensing hoses, they will separate at the designed pull force, reducing expensive damage to the dispenser and piping system. Internal dual valves close automatically during separation, stopping the flow of fuel from both the dispenser and the separated hose, reducing environmental and health risks of potential spilled fuel. Size 3/4″. Compatibility E25 & B20.