The Quick Sweat Tool is designed to help stop that pesky drip when soldering. First prepare the fitting or full port valve that you wish to solder, as well as, the pipe. Then, slip the 24" flexible cable thru the fitting or full port valve and into the pipe up to the indicator. Squeeze the handle and begin soldering. Let the pipe & fitting cool, release the Quick Sweat handle & remove the tool. This tool is meant to stop a slight drip. It will not hold back water under pressure. Other sizes available.