Plumber's Putty For pinhole leaks or slightly larger, or if you have a leak at a fitting joint, plumbers putty is the simplest way to plug it and is widely available both online and in-store at DIY and home improvement stores.

To stop a water leak in an emergency situation requires a water leak sealant like Adiseal. It can seal leaks instantly even in wet conditions like rain. Adiseal leak sealer provides a strong and durable waterproof seal in dry or wet conditions.

The most basic type of leak testing is the submersion or dunk test (also referred to as bubble testing), in which you pressurize the part, submerge it in water, then look for gas bubbles. Most commonly, compressed air is used for dunk testing and will test the part at various pressures and time frames.