An angle stop valve is a small shut‑off valve installed on the water supply lines for sinks, toilets and other fixtures. It allows you to stop the flow of water to a single fixture without shutting down the entire household supply, making maintenance and repairs more convenient.

Types of angle stop valves

• Multi‑turn (compression) valves: These traditional valves use a stem and rubber washer. Turning the handle multiple times raises or lowers the washer to control water flow. They are economical and the washer can be replaced if it wears out.
• Quarter‑turn (ball) valves: A ball with a hole through it controls the flow; turning the handle 90° opens or closes the valve. They are easier to operate and tend to last longer because there is less wear on internal parts, but they cost slightly more and must be replaced if they leak.
• Connection types: Angle stops are available with compression inlets for copper or PEX tubing, sweat/solder inlets for copper pipe, or push‑fit inlets that don’t require tools. Outlet sizes are commonly 3/8 inch compression for faucet and toilet supply lines, but valves with 1/2 inch FIP or dual outlets are also available.

Features and benefits

• Lead‑free construction: Modern valves are made from lead‑free brass or other approved materials suitable for potable water.
• Easy operation: Quarter‑turn valves require minimal effort and clearly show whether the valve is open or closed.
• Serviceability: Multi‑turn valves can sometimes be repaired by replacing the washer or tightening the packing nut.
• Compact design: The angled body directs water toward the fixture while keeping the handle accessible under sinks or behind toilets.

Installation tips

1. Shut off the main water supply and open a faucet to relieve pressure.
2. For compression valves, cut the supply pipe square and slide on the compression nut and ferrule. Insert the pipe into the valve body and tighten the nut by hand, then use a wrench to give it an additional quarter turn.
3. For push‑fit valves, ensure the pipe is smooth and free of burrs, then push the valve onto the pipe until it seats fully.
4. Connect the outlet side to the fixture supply line using a compatible connector (e.g., 3/8 inch compression). Hand‑tighten and then slightly tighten with a wrench.
5. Turn on the main water supply and check for leaks. Tighten packing nuts gently if a drip appears around the stem.

By selecting the appropriate type and installing it correctly, an angle stop valve provides reliable shut‑off control and protection for your plumbing fixtures.