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How to Hook Up a Shower to a Bathtub Faucet
How to Install a Shower Faucet (with Pictures) - wikiHow
Flex hose or flexible water supply lines consist of rubber hoses covered with a metal or plastic braid. Flex hoses have screw-on connections that easily install to existing threaded stop valves that connect to your house's plumbing and the sink faucet. The hex nut on the end of the flex hose eliminates the need to install compression fittings that pierce through existing pipelines and soldering copper pipes to new faucet supply lines. Wrap Teflon plumber's tape around the threaded ends of the faucet supply lines and the threaded ends of the shut-off valves. Tighten the nut ends of the flex hoses onto the faucet supply lines with an adjustable wrench. If the flex hose has compression fittings, it will have a large nut on the end and a smaller nut behind it.
I've got one of those big bathtubs that have no shower head in it. Instead of the faucet coming out of the wall, it comes from the top of the side of the tub. I guess thier solution to this was to put a large sink faucet on the tub instead of a normal tub faucet but this has created a problem for me.
In the single-hole faucet, the center control typically not only serves as the spout but the mixing valve as well. Depending on your existing situation, the faucet may be installed to the countertop or the sink, so if you are replacing one or the other, you have the option to change faucet type. If not, purchase a new faucet to match the type you already have. One added benefit of separate mixing valves is that most manufacturers use one valve with many different trims. This will let you change the style in future with less waste and work.