Developed a leak at the pressure gauge. I think to many times loosening it to drain it tore up the seal from the factory under it. Tried to figure out what was needed to reseal the stupid thing. Bought a cpl 1/8 bsp Dowty washers that were the wrong size. Was getting frustrated when I said WTH I will just screw it in there (after cleaning original seal debris) and guess what holding air fine
. When in doubt just try your gauges with nothing to seal behind them.
