#66777
impbarn
Member

The sealing surfaces should be very clean and also very flat. It should not have any nicks, scratches, or pits in it in order to provide a good sealing surface on either the body or the fitting. The washer should also be clean and flat. Copper washers can be annealed (brought to cherry red and left to cool slowly). This allows the washer to conform to the mating surfaces.

Good luck