Mr. HP has never closed or opened a shut-off valve that didn't leak at least a small amount of water. The Gordon Wrench is, and has been for years, an indispensable tool in Mr. HP's toolbox.

Install the New Valve You probably have a 3/4-in. pipe leading to and from the leaky valve. Buy a threaded replacement ball valve; it’s a far better choice than the older gate-style valve.