Over-tightening is a common cause of leakage.
- The Mechanism: The watertight seal is created by the O-ring compression, not by how hard you crank the nut.
- Risk: Excessive torque can extrude the O-ring or crack the bulkhead seat.
- Surface: Ensure the mounting surface is flat, smooth (Ra 1.6 or better), and free of burrs before applying torque.
- Washer: Always use the provided washer and nut to distribute the load evenly.









