i use a pure freedom reelmaster electric reel and it comes with a brass industrial rotary joint on the side with a 1/2 inch barb on it.....this has been the best fitting....its never leaked.....ive also got a manual cox reel with a similar brass joint on the side,again its never leaked.....
the brass hozelock swivel elbows always leak as i used to have one on a claber reel....i used to have to change them every few months....
in my experience its been worth investing in better,more professional reels just for the smooth and leak free operation that these types of reels provide.....