Toilet supply line:
The toilet supply line is an astounding mechanism that is built in a conventional system. The water supply system is mainly a small metal piece attached to one end of the wall, and the other is attached to the toilet. It is one of the most crucial parts of the toilet that is responsible for supplying water into the toilet. The valve size and the diameter of the flowing water jet are crucial for maintaining a stable mechanism.
What does the toilet supply line do?
A toilet supply line is the prime savior of the toilet structure. The water supply line, also called the hose pipe, is the main portion that keeps the water supply attached to the vigorous toilet lever and the internal parts. A controlling water valve can be adjusted to implement the proper channelization of water. These supply lines carry water from a nearby cold water source to the toilet tank. If you look vigilantly at the bottom of the tank, there might be a short line, usually chrome or white, that runs from the tank into the wall behind the toilet. 
What standard size is a toilet supply line?
You may find a lot of sizes of the toilet water supply line. But if you are not knowledgeable about the size of the toilet supply line, then you may face a disaster. Too much thin pipe will fail to supply the proper amount of water into the toilet; if the supply line is too thick, it will overload the tank within a blink of an eye. The main water supply line pipe is commonly standard, either 3/4 inch or 1/2 inch, and it is mainly the diameter of the pipe. Sometimes you can also buy the 3/8 inch pipe for the toilet’s supply line, which will definitely fulfill the purpose.
How to install a toilet water supply line?
The installation process of a toilet water supply line is one of the most troublesome chores that you may ever face. In most cases, the toilet water supply line is installed by a professional mechanic. Here I will elaborate on the complete procedure of how to install the toilet water supply line,
- You first need to measure the distance between the water supply valve and the place to which the supply line would be connected. This is crucial because it will be needed in choosing the right size water supply line.
- The next stage is to turn off the water supply line and incorporate a bucket or pot to store the extra water flowing when you unhook the water valve.
- Then you have to pull off the tank’s lid and initiate a flush that will remove all water from the tank. Using a sponge to soak all the remaining water as water will create an unnecessary hazard in installing a new water supply line.
- Then you need to buy a 3/4 inch or 1/2 inch, or /8-inch pipe for the toilet’s supply line. Ensure that the supply line is of the standard size; otherwise, it will be a disaster.
- Slide the compression bolts incorporated with the compression valve onto the pipe and fit the metal ring. Put the valve over the metal ring and tighten the nut. Hold the valve tightly with adjustable pliers and tighten the nut with an adjustable wrench.
- After you have installed the water supply valve, it is time to turn on the water supply line and check if there is any leakage.
How often should toilet supply lines be replaced?
The toilet water supply line is a phenomenon that is badly hampered by the inlet water flow and gathers so much of its lime molds that it corrodes the entire supply line. However, excessive mineral items present in water may also damage the enclosure. So the crucial thing is you need to replace or reshuffle the toilet water supply line every three to five years.
How to disconnect the water supply line from the toilet?
Most of the time, you might need to disconnect the water supply line from the toilet for the repair work. First, you need to shut off the toilet valve and water supply line, Then flush the toilet to get rid of all the water in the tank. Then locate the supply hose connector under the tank. Then unscrew the metal connector with the help of an adjustable wrench or adjustable pliers. If the nut is rusted, the fill valve may turn, turning the nut. Finally, unscrew the ending portion of the hose from the shut-off valve. The metal connector on that end needs a plier to be turned backward. Then simply disconnect the water supply line and perform the required repairing work. 
How to fix a leaky toilet water supply line?
The leakage of the water supply line is a common problem in the bathroom. Here is a step-by-step procedure to fix the leakage,
- Step-1
First, locate the actual place where the leakage has occurred. If the leak is located between the fittings, then there is no other way but to replace the water supply hose. 
- Step-2
Next, you need to tighten the juncture of the nuts and bolts of the supply line using a small wrench. Keep in mind that excessive pressure applied on the fittings may break the entire house.
- Step-3
The damaged washers can cause a leak in the toilet supply line. Check the washer; if it is corroded or destroyed, replace it. Sometimes cleaning it with detergent and a brush might do the work. 
- Step-4
If no fining procedure is working, then the only way is to apply the plumber’s tape on the threads of the fittings. Tightly apply plumber’s tape to the suspected areas, preventing leakage in the water supply line. Turn on the supply line to examine if the leakage is stopped.
Hi, this is Robert Crossan, the owner of this website, has 17 years of experience in the installation, maintenance, and repair of toilets and plumbing systems. After completing the Level 2 Basic Plumbing course in 2005, I started working in both domestic and commercial buildings as a professional plumber. So I can figure out the core difference between different toilet models and brands. It also helped me monitor their work performance and setbacks.