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Best practices is to stub out with copper made for adapting to pex, then use conventional stops

With little DWV experience, we always say to hire a pro to help you. There are so many ways to mess up in a slab that it is not recommended that DIY do underslab plumbing. I have seen too many failures to list.

American Standard Cadet 3 series and also Champion 4 series (excul. one piece) flush very well and are rated on MaP testing site at 1,000 grams Toto Ultramax II do not rate over 800 and we never recommend any WC that is not 1,000. Ultramax never rated well in any iteration I recall...

I've installed dozens of Navien tankless using 2" pvc straight up through the top of old B vent. I drill hole, push pipe through, caulk with silicone and use a rain collar and silicone the margins and have never had an issue.

atmospheric inhalation of the few plastic fittings in the waterway is extremely minimal.

You may want to search "funnel drain". There are many varieties but all typically made specifically for a drain body...

I have witnessed many hardwood floor refinishers use their home made clamp-on heavy duty extension cords with spring loaded clamps connected directly to the house main panel as the only way to run without trouble.

Delta has lifetime warranty. Call them for replacement part.

drilled in centers should have no impact and be code allowed. You will likely need a right angle drill.

no building dept would have schematics. Motors are supposed to be on dedicated circuits (this, off the top of my head and not from an electrical contractor). A powered attic fan will only have a minimal effect (I've had them and replace when they die) compared to improving insulation. of course...

O.P. do you have a furnace in the room near the water heater? If so and if it uses air from the room for combustion, then is could be the source of negative air pressure causing the backdraft on the WH

it is a normal drain valve. they don't put a handle on them to prevent dummies or children from tampering. Multi-turn valve it is.

It is not code to do what you picture. The vent should go all the way to tie in above all other upper floor fixtures or through roof. Adding an air admittance valve (also not typically allowed by code) would help if you don't do it to code.

You might try using waterproof plumbers silicone grease to rebuild the multi-turn with the old brass stems. Replacing with quarter turn stainless steel ball modern valves is the ideal choice.

A load calculation is called for to determine proper sizing of equipment. Rule of thumb or 'off the cuff' won't do. I would think that the original installation would have required load calcs. Check with your county inspection records for load calc record. Get multiple (at least two more)...

pull cart. , show pics, or search: https://barrywalter.com/index.html

1. There is no more non-pressure balancing shower valve sold. 2. For temp and vol. you need a thermostatic shower valve. Delta 1700 series is a low cost choice compared to Grohe.

yes, you can buy those flush elbows as single piece and two piece.

having a few different types of extractors is the best practice.

any of Toto's skirted toilets that use a 'unifit' adapter allow you to purchase a 10" rough adapter. I would not recommend any of Toto's Aquia line bc the mounting blocks are stupidly designed and folks don't like the poop streaks left behind.