Vintage Double Hose

Works with all short yoke USD and Voit Double Hose Regulaors……All you do is screw on your pressure gauge and slide the Mar-Mac banjo (O-ring on the banjo facing the regulator) between the cylinder valve and the regulator. Tighten it down a little more snug than you usually would and you are good to go. DO NOT OVERTIGHTEN…..The Mar-Mac banjo works best on the early type valves with the full sized O-rings on them (see pictures) It will work on some of the later types but I have found they tend to leak a lot when you use them with the thermo/blue steel/ DIN insert type valves. Hope this clears things up.