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I have gone from needing J valves to having too many. I would like to sell or trade four of them: Three USD J valves with the black plastic knobs and one all metal Seamco with built in HP port. PM me if interested.
They are actually pretty simple inside and easy to service, if you can get the parts. They are good to have if you have a DH reg and no banjo fitting. They can also save you a bit of change if you have more than one reg because you only need one SPG, not one for each reg.