how to stop a leaking pipe under the sink

Step 1 - Initial Inspection to Determine Leaks and Clogs. Position a bucket to catch leaking water from the drain pipes. Make a thorough inspection of the drain basket, which is a filter-type that attaches to the hole of the sink basin to determine whether sink debris is strained to allow water to pass through it. How to find the source of a leaking tub drain: If you can see the underside of the drain through an access panel or open ceiling, partially fill the tub and then release the water. In a shower, plug the drain with a rag