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I did it with 2 AN plugs. Drilled and tapped one for a threaded schrader air valve similar to that for a tire. Screw the plugs into the female hose ends of the hose assembly and pressurize (compressor is 125 PSI) then imerse assembly in water for a couple of minutes, looking for bubbles. Works well, about $10.00 per hose size.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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