When to Replace Your Shut Off Valve

Brass shut-off valves last 15 to 25 years. Plastic (CPVC or PVC) valves last 10 to 15 years. Chrome-plated valves... the shiny ones under most sinks... are brass underneath but the chrome can flake and the internal components are often lower quality, lasting 10 to 20 years. The type of valve matters more than the material. Ball valves use a solid ball with a hole through the center, controlled by a quarter-turn lever handle. They're the gold standard... reliable, durable, and almost never seize. Gate valves use a wedge-shaped gate that screws up and down with a round handle (multi-turn). They're the ones that fail. The gate corrodes, the stem seizes, and mineral deposits build up on the sealing surfaces. Most homes built before 2000 have gate valves. Newer homes increasingly use ball valves. The #1 killer of shut-off valves is non-use. A valve that sits in the same position for years develops mineral deposits that essentially glue it in place. When you finally need to turn it off in an emergency... it won't budge. Or worse, the stem snaps when you force it, and now you have a broken valve AND a water emergency. Every home has 10 to 20 shut-off valves: under each sink (2... hot and cold), behind each toilet (1), at the water heater (1-2), at the washing machine (2), and the main shut-off where water enters the house. The main shut-off is the most critical and the most often neglected.

Replacing an under-sink or toilet shut-off valve takes 15 to 45 minutes for a DIY job, depending on the connection type and accessibility.

SharkBite push-fit: 10 to 15 minutes total. Shut off the main water supply, drain the line by opening the faucet, cut the pipe cleanly with a pipe cutter, push the new valve on until it clicks. Done. No tools beyond a pipe cutter ($10).

Compression fitting: 20 to 45 minutes. Shut off the main water, drain the line, unscrew the old compression nut, slide the old ferrule off (this is the hardest part... sometimes you need to cut the pipe below the ferrule), install the new valve with new ferrule and nut, tighten with a wrench until snug plus 1/2 turn.

Soldered (sweat) connection: 30 to 60 minutes. Requires a propane torch, solder, and flux. Shut off the main water, drain the line completely (any water in the pipe prevents a good solder joint), heat the joint, apply solder. This is where most DIYers switch to SharkBite instead.

The most important step for any method: after installation, turn the water back on slowly and check for leaks at every connection. Place a paper towel under the new valve and check again in 24 hours. A slow drip might not be visible immediately.