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The supply line is blocked, tank is too high, etc
Supply coming from water source is a water service line.
A PVC ball valve, and add a threaded coupler to attach the supply line from sink.
It will be close to the inside wall where the water supply passes into the house from the line going towards the water meret.
Broken supply line or drain. Crawl underneath and see which.
== == Two possible problems............... The main shut off valve in the house is closed from the in-coming city water supply line, or the city supply line is shut off at the street .
There should be a shutoff at the wall where the water line enters the house. There may be one before the water heater or there will be one at the water meter.
I have never seen a faucet that has a nut on the line coming out of it. Usually it is a male connection and the nut is on the supply line between the faucet and the house supply. Anyway, if the line coming out of the faucet is messed up, you could probably cut it and use a compression fitting to go between the faucet and the supply line to the house line.
supply potable water
YES and No Yes if you are going to be working on the gas water heater and No if you are working on a cold water line and if you are working on a hot water line you can shut off the gas or electric to the water heater so in case your water heater drains but what I usually do is just turn the water heater's water supply valve off.
That depends on the pressures you are running off the Engine and the G.P.M your achieving at the business end? Theoretically, you would need a 3 inch supply line too supplement two 1.5'' lines,You need to put in enough water supply to achieve the output of water, unless your utilizing tank water.
Every geographical area in the wrld is different. Find out how deep the Frost line is for your area and bury the water line six inches to one foot below that.