Ball valve

Inside a ball valve is a metal ball with a hole through it; turn the handle 90 degrees and the flow stops completely. They are more reliable than the old round-handle gate valves, which tend to seize or fail to seal after years of sitting untouched. When we replace a main shut-off in an older Marion home, a ball valve is almost always what goes in.

Why the style of your shut-off valve matters in an emergency

A shut-off valve gets judged on one day: the day a pipe bursts. Gate valves — the round-handle kind found in most pre-1990s basements — sit untouched for decades, then seize, snap their stems, or close without actually sealing when you finally need them. A ball valve has almost nothing to go wrong: a quarter turn, a solid stop, and a handle position that shows at a glance whether it is open or closed. That difference is measured in how many minutes water pours into your basement while you fight a valve.

When to replace an old valve instead of trusting it

Test your main shut-off and fixture stops gently once or twice a year. A valve that will not turn, weeps from the stem when operated, or spins without stopping flow has already failed — it just has not been caught yet. Round-handle gate valves at the meter, corroded fixture stops under sinks and toilets, and any valve that requires pliers are all candidates for replacement on your schedule rather than during a flood. Swapping them is quick work when it is planned and miserable work when water is already on the floor.