Fuel Rail Pressure Adapter Test Kit - 11mm & 16mm

Purchased the kit to get the 11mm Nissan adapter. Machine work was good quality. Diameter of male & female ends were correct. Unit leaked on first use because "O" ring size was apparently incorrect. Had to buy a metric "O" ring kit in order to get one correct size "O" ring, and change out the speed connect fitting. With all that, fuel pressure was verified to be correct. (It was the upstream O2 sensor.)