Instant push-fit connection for increased ease-of-use- no soldering required. Fittings certified to 200 PSI and 200 degrees. Fits OD controlled copper, CPVC, or PEX pipe. Design certified and agency listed. Compact, corrosion resistant, robust DZR brass body. Approved to be used underground and behind walls without access panels. Designed for hydronic heating as well as potable water distribution.