Might try a hozelock. My brass one leaks until pressure is built and I have to work around it. Life would be easier if it didn't leak, but durability would be an issue I'd think.
Is durability an issue because your reel is not van mounted ?
I use a £1 B&Q female hoselock onto a brass swivel and a metal reel bolted to floor, always pressured up and ready to use and no leaks whatsoever.
Suppose durability would only be an issue if you were constantly connecting and disconnecting.