Ask your do it yourself plumbing questions and get free answers as well as DIY information about faucets, toilets, pumps and water filters from plumbers at Plbg.com. A toilet supply valve should always be fully on or fully off, so there is absolutely no advantage to the older type valves. You might also want to consider opening the wall and raising the pipe several inches.
Yes, it very well could mean having to sweat a joint or two, but unless you are totally inept, this is a relatively quick and simple job. The water shut-off valve for a toilet should typically be located behind the toilet, near the wall. The valve may be within a few feet of the toilet on the side or in front, or it can be farther away, near the pipes that run from the toilet to the water line.
Standard Toilet Shut-Off Valve Size & Types
Supply: One supply for cold water is installed 9 1/4" from finished floor and offset 6" to the left of toilet center. This is terminated with a shut-off valve with a 3/8" O.D. (outside diameter) compression fitting.
Your toilet and faucet supply lines likely have the same tubing width. For example, the official California Plumbing Codes agree that the minimum pipe sizes must be at least half an inch for a typical flush tank urinal and most sinks. However, the connectors on the ends of the tubing and the shutoff valves can vary.
Toilet Venting Options: How To Vent a Toilet (2025)
Incorrect water line height causes poor fixture connection and leaks. Water supply lines for toilets typically come out about 6 inches above the finished floor, while sink supply lines are usually 12. The toilet shut-off valve (stop valve) is a necessary part of the plumbing system typically installed behind the toilet bowl.
Its primary roles are to control the water flow from the supply line to the tank and stop it from uncontrolled flowing. The flush valve height from the floor is a critical measurement in bathroom design, especially for those focusing on maximizing space and functionality. Generally, the standard height for a flush valve is about 15 to 20 inches from the floor.
Toilet shut off valve replacement - YouTube
Position: The angle valve should be installed on the side of the toilet, not at the back. This placement allows for easy access in case of repairs or adjustments and avoids interference with the toilet's installation and removal. Height: The angle valve should be installed approximately 6 inches (15 cm) above the floor.
Obviously the S-trap and flexible tube need to be replaced with a proper P-trap and air admittance valve (the AAV would be appropriate because the vent stack pipe to which the drain is connected is about four feet away horizontally in the basement one floor down). I also want to add proper quarter.
