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Water Supply Valve

The Water Supply Valve and toilet tank hose are almost always located at the bottom left-hand side of the toilet. There are two main types of water supply valves found on toilets: ball valves and multi-turn valves. These valves, in the plumbing industry, are commonly referred to as stops.

A valve or stop in a home will normally be connected to either a copper pipe, or a threaded iron pipe depending on the home's configuration.

There are dozens of different types of stops and hoses available at hardware stores. For almost every home, the best configuration for toilets is this 1/4-turn angle ball stop with a 1/2-inch male iron pipe outlet connected to a braided nylon or stainless steal toilet tank hose. This valve and hose provides the best overall reliability, ease of instillation, and performance.

Since shopping for this configuration can be so confusing, it is helpful to understand how manufactures label the different types of stops and hoses.

Water valves or stops, are identified by their style and connections. There are straight stops and angle stops with both having either a multi-turn or 1/4-turn ball shut off. This stop is called a 1/4-turn angle ball stop, with a 1/2-inch nominal compression inlet (to attach standard copper pipe) and a 7/16 to 1/2-inch slip joint combination outlet. The outlet is converted by the removal of slip joint nut and compression gasket, to reveal the desired 1/2-inch male iron pipe outlet, a connection that is ideal for the recommended toilet hose.

If a stop for a threaded iron pipe is needed, it would be a 1/4-turn angle ball stop with a 1/2-inch Female Iron Pipe or FIP inlet, and a 7/16 to 1/2-inch slip joint combination outlet.

The Toilet Tank hose, which connects the angle stop to the toilet, comes in a variety of inlet connections. Every hose, having a standardized 7/8-inch Ball-Cock outlet, connecting to either a Toilet Fill valve or Ball-Cock supply valve. Since this valve has a 1/2-inch male iron pipe outlet the hose needs to have a 1/2-inch Female Iron Pipe inlet in order for the both to connect. Of all the different kinds of hoses available, the ideal hoses are the new nylon or stainless steal braided flex type. These hoses are very durable and can last for years without leaking. When selecting a 1/2-inch FIP toilet hose, 6 thought 20-inch lengths are usually available. Make sure that there is enough length so the hose is not kinked when it is connected to the valve and the toilet.

This is the entire water supply assembly needed to make a copper pipe connection. This assembly includes the angle stop with compression ring, and nut, and the toilet's tank hose. In order for the copper pipe to make the required connection the valve's lock nut slides over the water pipe. Then the compression ring is slid on the pipe. Next the pipe is fully inserted into the angle stop and the lock nut is securely tightened. During tightening, the compression ring is compressed onto the pipe, creating a watertight seal.

Here is the water valve assembly for an Iron pipe, which consists of the angle stop and toilet's tank hose. For Iron Pipes, the threads of the pipe are wrapped in Teflon pipe tape and screwed into the angle stop.

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