All done, knock wood. I replaced about 10' 7" of 1/2" galvanized pipe and a 90° elbow likewise, a ball valve and a nifty little copper triple-elbow with the same length of copper, plus a little to make up the vertical run and used the scariest, kewlest 90°s and couplings I've ever seen: SharkBites.
A hired plumber used them in the last repair to our...interesting plumbing, mostly because he was in a hurry and wanted to slambang it together with copper, this being a bit quicker than PEX for an old plumber because the support requirements are simpler. I was at work while he assembled it but I admired the end result and he pointed out there was a dealer a middlin' short drive away and that it was something a homeowner could do.
It's not the cheapest way. Most half-inch fittings in this line have an MSRP a bit North of $8.00.
However, the connections will work with anything of the proper outside diameter -- PEX, copper, whatever. They double-click right together and there's the scary part: they're too darned easy! You can give 'em a forcible yank to check but assembly still seems too gentle to be real. (There are special tools to release them, which of course I bought).
Started 1400, +/-, and finished the job around 1600, about the time Tam arrived home from her visit to the Auld Sod. I've had pressure on the system since 1630. We've subjected it to rapid shut-offs and so far it's all holding.
I still go and check every so often. I'm used to having to solder water pipe or wrench it together, either one with a lot of effort and redoing as needed. There's some Calvinist core in my mind that has trouble trusting anything that easy.
My out of pocket was a bit over $120.00, $40.00 of that for a very high-zoot Rigid brand tubing cutter. (I can't help it; one from the five and dime would probably do as well but the blamed thing is just so nicely made). I bought twice as much water line as I needed, one 20' stick. Actual project took about two hours, including draping a tarp over some of the shelves and removing the old iron pipe. One reason I keep checking is there are two 90°s and a straight coupling over one corner of the area where I have my ham radio setup; it's not really tarp-able and so I fret.
Time will tell. Wish me luck.
1. One advantage to having a basement fulla tools and such, the pros see it and some of them seem to assume I know which way is up.
2. There is no way I can phrase this without someone essaying a double-entendre. Consider your ace trumped already.
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