LTWFITTING 5/8-Inch OD x 1/2-Inch Female NPT Brass Compression Fitting Connector - Pack of 150 - for Plumbing, HVAC, and Industrial Applications

These enable easily, and without heat to provide access for future or present taps for additions to water service. In my case, heat would have been a problem due to the location of the plumbing. I built a stub with a male adapter off site with a cap for future use. I simply tied in to the existing with the compression fitting and will utilize this later with little effort.