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Angle valve sizes explained — and how to pick the one that actually fits

2026-07-03

A gate valve is a small stop valve commonly found beneath sinks and behind toilets. Most people don't think of them until there's a leak or when they need to replace a faucet. At that point, size becomes extremely important. Here's what you need to know.

Two important measurements

A gate valve has two ports: one connects to the pipe on the wall, and the other connects to the water supply hose and then to your faucet. Before purchasing, you need to know two sizes. The most common inlet size for most homes is 1/2 inch, but the type of thread is also important - it could be metric or imperial, and NPT (conical) or BSP (parallel) threads. If both are used, no matter how tightly it is screwed, it cannot be properly sealed.

The common sizes you will typically see

For home use, the most common inlet size is 1/2 inch. The outlet is usually 3/8 inch and can connect to a standard woven water supply hose. Some older homes use an 3/4 inch inlet.

How to choose the right one

First, measure or check your wall pipe size. Then determine the specifications needed for the water supply hose on the other end - if unsure, you can check the parameters of the faucet or toilet tank. If the sizes don't match exactly, you can use adapters and converters to solve the problem, but the fewer connection points, the fewer potential leak points. For durability, choose brass valves - cheap zinc alloy valves will corrode and crack over time, especially in hard water areas.

A point often overlooked by people

The type of valve is also important. The quarter-turn ball valve is easier to operate and more reliable than the old multi-turn gate valve. If you are replacing an old valve, consider upgrading to a ball valve. The price is only a few dollars more, and you won't have to worry about a stiff handle anymore.

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