Symptoms
- Drip from the spout with any handle position
- Leak at the base where the handle meets the faucet body
- Faucet has a single ball-shaped part visible when the handle cap is removed
- Faucet is an older Delta-style ball design
Likely causes
- CommonWorn seats and springs inside the ball assemblyThese small rubber seats and springs wear out and are usually replaced together as a kit.
- CommonWorn O-rings around the ballCause leaking around the base rather than the spout.
- PossibleScratched or worn ball itselfA pitted ball surface won't seal well against new seats.
- PossibleWorn cam and cam washerCan cause the handle to feel loose along with leaking.
What to do
- Turn off the water supply and open the faucet to relieve pressure.
- Remove the handle, cap, and collar to expose the ball assembly.
- Lift out the ball and inspect it for scratches or pitting.
- Use needle-nose pliers to remove the small seats and springs from inside the faucet body.
- Install a full repair kit with new seats, springs, O-rings, and cam assembly matched to the faucet brand.
- Reinstall the ball in the correct orientation using the manufacturer's alignment guide, usually a small slot or key.
- Reassemble the cap, collar, and handle, then turn the water back on slowly and test.
- If leaking continues after a full kit replacement, the ball itself may need replacing too.
Tools and parts
- Adjustable wrench
- Needle-nose pliers
- Screwdriver
Ball faucet repair kitSearch: “single handle ball faucet repair kit”
When to call a pro
Call a plumber if the ball itself is worn and a matching replacement is hard to find for an older faucet model.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.