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How to properly tight copper union?
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07-02-2020, 03:29 AM
Like this one:
https://www.amazon.com/Everflow-Supplies...B016Y9V89C How much cranking do you have to do to get it to seal?
VH07V
07-02-2020, 08:11 AM
(This post was last modified: 07-02-2020, 08:15 AM by K. L. McReynolds.)
What type of fitting are you screwing into? The threads on that will need pipe dope(I prefer that over tape) and are tapered threads, needing screwed into a tapered female fitting. Generally, tighten until the force is tight and about a quarter turn more.
The trouble with that type fitting is the copper end needs to be sweated first, meaning joining means holding that fitting and turning the other end. 
07-02-2020, 08:25 AM
(07-02-2020, 08:11 AM)K. L McReynolds Wrote: What type of fitting are you screwing into? The threads on that will need pipe dope(I prefer that over tape) and are tapered threads, needing screwed into a tapered female fitting. Generally, tighten until the force is tight and about a quarter turn more. +1 Like Mack said... What exactly are you doing? If you use something like Blue Rectorseal you won't have to crank it down very hard. Snug and maybe a 1/4 turn after that. IMHO, everybody who does any of their own plumbing work should own a can of Rectorseal. It never completely hardens so it's easy to dissemble if needed. 
07-02-2020, 10:53 AM
(07-02-2020, 08:11 AM)K. L McReynolds Wrote: What type of fitting are you screwing into? The threads on that will need pipe dope(I prefer that over tape) and are tapered threads, needing screwed into a tapered female fitting. Generally, tighten until the force is tight and about a quarter turn more. +1
Steve
Mo. I miss the days of using my dinghy with a girlfriend too. Zack Butler-4/18/24 The Revos apparently are designed to clamp railroad ties and pull together horrifically prepared joints WaterlooMark 02/9/2020 
07-02-2020, 12:15 PM
That's a union, there is a center sealing interface. I think he understands the male NPT thread.
For that interface though, it would be similar to the NPT. You could always snug it more if it drips.
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07-02-2020, 04:29 PM
The fitting has 2 sets of wrench flats for a reason. Use 2 wrenches. Common mistake is to get enough solder in the fitting that it runs down to the mating faces. It’s trash if you do. A dielectric union will have a rubber gasket between the sealing faces and is easier to seal. Ensure you aren’t breaking a ground path if you go that route. Properly aligned, allowed to completely cool, soldered carefully and tightened with 2 wrenches, the fitting you listed should give no issues.
Blackhat
Bad experiences come from poor decisions. So do good stories.
07-02-2020, 05:56 PM
Yes the female threads to fixture, no problem. It’s the two mating faces of the union. As to the soldering, I will be making up the fittings with the faces up, so there shouldn’t be any drips getting in the way.
I guess the technique will be to keep tightening until there are no leaks. Bad thing about these types fittings is there are three places where can be a failure. I can’t use dielectrics in this situation. It’s for a UV light and the maker strongly recommends against using dielectrics. Apparently, there is enough UV, that it destroys the plastic in the fitting.
VH07V
 (07-02-2020, 03:29 AM)EightFingers Wrote: Like this one: you can't use one of these? ![[Image: 104_10030330.webp]](https://www.plumbingsupplynow.com/pub/media/webp_image/catalog/product/cache/90b8d62cc0585e4acdd654e762f1af49/1/0/104_10030330.webp) depending on where you are using it might look at one of these ![[Image: 421319LF_usn.jpg]](https://content.interlinebrands.com/product/Image/Detail/10070/421319LF_usn.jpg)
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