Use the following procedure to tighten the flare fitting:
Tighten the nut until it makes contact with the seat. Make a mark across the flats of both the male and female parts of the connection (Item 1) [Figure SPEC- 40-4].
Use the chart below to find the correct tightness needed (Item 2) [Figure SPEC- 40-4]. If the fitting leaks after tightening, disconnect it and inspect the seat area for damage.