The nut is the primary seal, the O-ring is the secondary seal and helps absorb vibration and pressure pulses at the connection [Figure SPEC- 40-9].
The hex portion of the nut does not contact the surface of the component when the nut is tight.
Use the following procedure to tighten the port seal fitting:
Port seal and nut, washer and O-ring (O-ring Boss) fittings use the same tightening torque valve chart.
If a torque wrench cannot be used, use the following method.
Tighten the nut until it just makes metal to metal contact, you can feel the resistance.
Tighten the nut with a wrench no more than one hex flat maximum.
Do not over tighten the port seal fitting.
NOTE: If a torque wrench cannot be used, use the hex flat tightening method as an approximate guideline.
NOTE: Port seal fittings are not recommended in all applications. Use O-ring boss fittings in these applications.
