I'm embarrassed. Did something stupid.
We ordered a new washer/dryer to be delivered and installed. But the old units must first be disconnected beforehand by the owner and readied to be taken away. No problem, I thought.
Well it was a problem.
The hoses unscrewed very easily from the back of the old washing machine, but the installers insist on fitting entirely new braided hoses. So the original rubber hoses first had to be removed entirely (by me) from the shutoff valves. Except I can't get them to budge. They're seized on solid. Surprisingly, the shutoff valves work fine. I just can't get the hoses off.
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So, I just cut the valves off and installed brand new 1/4 turn ball valves. I soldered on threaded couplings, which the ball valves screw into. Clever, eh? That way if I ever eventually need to do this again, I can just unscrew the valves to replace them. No further soldering required.
So, run all the way back down to basement to turn the water back on, run back up to the laundry room to check for leaks. All looks good. Solder joints are beautiful and water tight. Oh, wait a sec. It's dripping from both of the threaded joints. Darn.
Run back down, shut off the water, run back up to open the ball valves to release any pressure and drain the pipes again. Unscrew both ball valves, wrap some more tape around the threads, screw the valves back in a little tighter this time. Should be good to go now...
Run back downstairs, turn the water back on, run back up to check for leaks...
OMG!!!
I'd left the ball valves turned wide open! There's water BLASTING everywhere! Brilliant.
My wife was deeply (ankle deep) impressed by my plumbing handiwork.