the only thing I can say is make sure vents off sinks go straight up til they are 6" or more above the flood rim of sink. as far as cleanouts I would put on stub outs for both sinks then trap off sink. also for vents use a sanitary tee. one is usually good around here...
you need to remove the existing aerator. you are correct that is a internal/external thread to match different faucets. once you take that off you should be able to attach the spray head you want. they usually come with different adapters for different style faucets.
its tricky but if you have no accesss from underneath you can push slightly down into shoe and slide gasket out. use same procedure to install new gasket. looks like the adapter inside shoe is for toe tap... make sure you putty the new toe tap on top. only other option is to open wall behind...
sorry took so long to reply been a crazy week. its ok if piece inside breaks youll get a new one with new cartridge. it has to come out. its just stuck in there. try needle nose pliers with force. also remove cover plate there may be a retaining nut holding it in as well.
i would try it on the least used tub first in case you have any issues. its all threaded connections so worst case you could replace with modern chrome threaded fittings and valves. look on home depot or lowes or plumbers supply house
Common fault 1: Low boiler pressure
The Cause: If you’re done all the usual checks (including checked the radiators for leaks and looked at the pressure relief valve without finding any faults), it could be the automatic air vent. You’ll be able to tell by taking off the plastic bottom panel and...
3/4" Sweat QuickFit Zone Valve w/ End Switch, Terminal Block
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