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I always sleeve the pipes either with plumbing tape or use insulation or conduit. Sometimes as retrofit like your situation I carefully chip concrete and use spray foam to fill up the gap to isolate the pipe.


We always sleeve pipes where it goes through the wall with another short length of pipe.


This is a hot water run.... the purpose of two pipes rather than one pipe for the run is to insure that when someone turns on the washing machine while you are in the shower you do not get a shock of hot or cold water...the value between them is to enable work on one while the other is open [ turn the shock proof on or off ]


It is a bypass valve meant to be opened when the other two valves are closed. The horizontal pipe above is connected using two diverter tees: In a one-pipe system, each diverter tee restricts flow to direct a portion of the hot water through the local radiator and then return that flow back to the main line. If the radiator in this room were shut off ...


Normally it is perfectly acceptable for copper piping to come into contact with (or even be embedded in) concrete. Pre-cast concrete block is often an exception. This is a quote from the Copper Development Assn.: "copper should be protected when it comes in contact with concrete mixtures that contain components high in sulfur, such as cinders and fly-ash, ...


If the refrigerant has been removed, this is an easy task. I'd assume the refrigerant was recovered when the old condensing unit was removed, but I only know what you've told us. If there's no refrigerant in the lines, simply cut them out any way you like. Take the copper to the local scrap yard, and you can pay yourself for the work. If the refrigerant ...


The drop ears are used when the plumbing should remain stationary, usually at the termination of the water line. A shower head may have a nipple (or stub out) tightened to it, usually with a cap when pressure tests are run. But the type of material used for a nipple ,as you mentioned, is dictated by the existing piping. Early plumbing lines used galvanized ...

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