O-ring and retaining ring sealing spot-faced surface must be square to thread in port; Machining operations such as A and D6 not required when port surface complies with requirements.
The sealing take place by means of a profiled ring of elastomeric compound seated in a groove located under the hexagon. Spot-faced surface must be square to thread in port. Machining operations such as A and D6 not required when port surface complies with requirements.