Things You Will Need
When the value is then turned--generally to make a plumbing repair--the O-rings can no longer create a watertight seal against the valve’s internal surfaces. A water shutoff valve can often be repaired by replacing the O-rings.
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Turn off the main water supply.
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Remove the valve shutoff handle with a Phillips head screwdriver.
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Loosen the packing (retaining) nut with a wrench.
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Remove the stem from the valve. Remove the old rubber O-rings from the valve stem. Clean the stem, then replace install the new O-rings.
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Insert the stem back into the valve and replace the packing nut. Replace the valve shutoff handle.
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Turn the main water supply back on. Check for leaks. If the valve still leaks you'll need to replace the entire unit.