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First, the nomenclature. If I were to buy a 3/8 inch outlet compression shutoff valve, I would be looking at a male threaded outlet, with a ferrule and end cap. The expected usage would be to insert 3/8 copper through the end cap, then the ferrule, into the valve and tighten down the end cap...

So I'm planning on installing a recirc pump on my hot h2o tank. See pix. The current hot line is 3/4 " copper. I plan on attaching the pump directly to the hot water tank, and was also planning to use a braided supply line to give me some 'wiggle room' for where I attach to the copper on the...

So my house has 3/4 in copper plumbing. I'm replacing the frostfree sillcocks (10 inches long with fancy-schmancy devices for those who can't remember to shut off their outside h2o in the winter), with simple standard hose bibbs. Here's my question: When replacing the sillcock, I can either use...