Everflow Supplies CCMU0001-NL 1" Lead Free Copper Union Fitting with Sweat to Male Threaded Connects

Really solid copper union. Fitment was perfect on both the sweat side for 1" copper pipe and the threaded side, as well as the union. Threads are machined well and fit together perfectly.No leaks at all after installation - BUT because the threads are so big, I couldn't put enough teflon tape in place to seal it properly and I had a few drips. I removed the teflon tape and went with PTFE paste instead and now everything is 100% bone dry!

There are a number of responses about getting these to seal, and I've experienced the same thing. This type of metal-to-metal seal requires the sealing surfaces to be just about perfect. The inverted-bevel on the brass-side is usually fine, but if there is any imperfection (nick or scratch) on the copper side it could easily leak. Before trying the following, make sure there the imperfection (if it has anything) isn't TOO big - Just send it back if so. If you see or feel anything MINOR, here's what I did to ensure no leaks on mine: Take 1000-3000 grit sand paper and _carefully_ sand out any imperfections - Try to do this as evenly as possible. Don't try to reshape it, the goal is to make it super smooth. I followed that up with super fine Crocus cloth, which can polish to almost a mirror finish. Prior to assembly, put a light film of plumbers silicone grease on the bevel, copper ring, AND on the threads. Then get the two biggest wrenches you have (I used two 15" crecent-type wrenches, 18" would probably be better) and REALLY crank the nut down. If you're a "smaller" guy (or gal), crank it down as hard as you can.TLDR Summary:1. Send back if defects on sealing surfaces (copper especially) are too large.2. Polish the copper side; Sand paper and polish with super fine crocus cloth.3. Use light film of plumbers silicone grease on sealing surface AND threads.4. Don't be afraid to crank this down using a lot of force.4-of-5 Stars because of the additional work needed to get a reliable seal. YMMV

Purchased four of these for a water softener installation. The heavy duty construction gave me confidence these would seal properly. They were fairly easy to solder 1" copper piping to. On the threaded side, I used teflon tape with a little bit of Oatey pipe dope for connection to the whole house filter and 1" corrugated stainless steel tubing. Absolutely no leaks. Would highly recommend for any 1" piping job!

Great product when replacing the old water system to a new one.

The fittings I received (April 2023) are made in South Korea. The fittings are obviously made precisely, they don't use ferrules or rubber seal.