Figuring out the Standard Toilet Supply Line Size to Install at Home

Determining the standard toilet supply line size will depend on some factors. The best way to know the standard size of toilet supply line is to know the standard size of each part making up the system. Continue reading to know the answer!

For the drain pipe, which is used to carry waste away into the main drain line of your home, the standard size of the pipe is 3” in diameter, although those which diameter may reach up to 4” are also often used.  Meanwhile, the standard size of water supply line toilet is 1/2″, with copper makes the standard material of choice.

The other aspect of standard toilet supply line size you should take into account is the closet bend, an elbow joint found under the toilet to connect the vertical toilet drain pipe towards the sloping drain pipe, which leads to the main drain stack of home. There are 2 diameters: 3” diameter for the one on the top, and 4” for the other end.

Last but not least, there’s drain line that can be found between the closet bend and the drain stack. The standard diameter is 4”, which is the one for toilet installed in most homes. The larger diameter for this standard toilet supply line size is used only for high rises, apartment complexes, and large industrial buildings.

Figuring out the Standard Toilet Supply Line Size to Install at Home

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