I'd like to pressure test my a/c repairs with nitrogen prior to charging the system, and am running into problems finding an adapter to connect the output from my regulator (1/4" male pipe) to the yellow hose on my manifold gauges (1/2" female acme). I've struck out calling local refrigeration supply houses, and wonder if anyone can suggest a source, or a combination of adapters to get the job done. It looks like the adapter I want is 1/4" female pipe-to-1/2" male acme.
Thanks for any suggestions!
I'm sure such a fitting exists...somewhere. If you can't find any other way, it's easy enough to find 1/4" male pipe to 1/4" male flare fittings at most hardware stores. I haven't looked much for 1/2" acme. Then stick an R-12 to R-134a adapter on top of that (1/4" female flare to 1/2" male acme).
this is also an option, but you'd have to cap off the port you're not using.
I've never seen an adapter that can do this in a single piece. You would start with the "vacuum pump adapter" to get to 1/4" flare, then a widely available flare to NPT fitting to get to pipe threads.
There also exists a simpler vacuum pump adapter which instead of a tee is straight thru to Acme only, though I didn't find it on the AMA site.
Another option like Leggie said is to put an ordinary port converter (as used for retrofits) on the flare fitting from the regulator. Couple one of the manifold hoses to the port converter and the other one to the car. Leave the yellow hose blanked off. Open both manifold valves to let the nitrogen go through and fill up the car.
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