https://www.youtube.com/channel/UCnorhjQR4zJkT7AVNhu395Q/vid...
Friendly, super knowledgable, takes the fear out of the DIY.
For electrical, I do a lot myself, but when it came to running a 50amp line + breaker panel inside my place (which also required outdoor ladder work) to replace the steel conduit indoors, I just hired a professional even though it was very expensive.
^ I'm knowledgeable enough to do my own wiring and plumbing, but pay for licensed/bonded contractors instead. I sleep better at night and my insurance company probably does as well.
As far as insurance companies... I bought an old place... I'm finding all sorts of stuff that isn't up to code (hidden electrical boxes, in the floor!, with wire nuts and not even twisted together wire and not even grounded properly)... I'm bringing it up to code, with modern products... in a court of law, it is going to be hard for them to argue against me.
I've gone with ss crimps instead of copper rings too. Mostly cause I live near the ocean and the ss crimps just seem easier to use.
200' of blue/red sharkbite brand pex b tubing is only about $70 on amazon right now, amazing.
But yes, in general I'm always for people becoming familiar with tools and DIY.
[EDIT] Actually, my parents' very-new house has that... but because it's all-PEX, so it's super-easy to install it that way, with a central panel full of shut-offs for various parts.
FWIW a SharkBite valve or NPT adapter would seem to be a handier thing to have around than a pure cap. For one, you can attach a valve without shutting the water off.
Also I don't know what you mean about sewage contamination? Sewage contamination of potable water lines would indicate a hugely weird problem.
AFAIK backflow preventers (fancy check valves), which prevent water in the house from going back into the municipal distribution, are standard on new installs. But I think that requirement is recent as of the past few decades, so most houses aren't going to have them.
Yes, I agree isolation valves are good. But as far as what code requires? It seems that if isolation valves aren't required on branches, then the only isolation valve that is required is the main house valve that can isolate it from the street water main.
So I can't figure out what else you think would have been required to pass inspection in the comment you originally responded to.
Haha...should is doing a lot of work here. Shut off valves like you mention are great, but even newer houses often don't have them.
PEX is very very not-great. It's constantly leeching carcinogens and endocrine disruptors into your sitting water. Your modern home's recirculation system is making that even worse, cycling hot water and concentrating leeched petrochemical products in your hot water line. Some of them even boil before water which means they'll make it through a distiller.
Plumbers like it because it's easy/saves them time, and they'll love charging you big $$$ to rip it out in 20 years when it's banned.