Yes it is the 1/4" brushless impact. Now I need to drive some screws (though I don't have any immediate projects for that).
PEX - the plumbers put it in when half the house was 95% rebuilt. I sold all the copper that was taken out to the metal recyclers. All of the "water use" places are in that half so the only copper left runs from the pressure tank in the basement of the original house to the point they started working.
PEX is a lot easier than copper. When we rehabbed the prior house 30 years ago there was no such thing as PEX, I cut a LOT of copper pipe and sweated a LOT of fittings and shutoffs. Only had to redo one.
With PEX you just cut the tube with tube or PVC cutters, snip. You can use "Shark Bite" or similar fittings, they just press in. I did that when I put in the 12 gallon 110V water heater in the crawl space under the kitchen between the on demand propane heater and the water using sources. BUT I've since heard they aren't "life time" and shouldn't ever be used inside a wall so I forked over for the ratcheting clamp tool, which I may or may not ever have another use for, for this project. Given the valves are in a closet, if they developed a slow leak after a time it would be quite a mess and not noticed for a long time.
Installing PEX fittings is really easy, you can either use clamp rings (and tool) or crimp rings (and tool)
clamp vs crimp
My relatively inexpensive clamp tool doesn't have the ring cut off feature mentioned in the video. PEX, unlike copper and PVC, is flexible so it is easy to run the pipe. The plumbers used crimp rings and a very expensive (like over $700 expensive) battery tool that did the squeezing, no hand squeezing necessary. I'm sure it is easy for a working plumber to justify that cost given the number of fittings they install in a month let alone a year.
What I know about plumbing..........make a phone call!
And empty your wallet
