Design certified to ANSI/NSF-61 NSF-372 NSF-14 and ASSE 1061 product standard. Instant Push-Fit connection for increased ease-of-use. No soldering, clamps, unions, or glue required. Fittings certified to 200 PSI and 200°F (93°C). Fits copper tubing, and CTS CPVC and PEX and connects all three types in any combination. Integral tube liner for PEX installations, so no loose components, ensures secure, reliable connection. Design certified and agency listed. Compact, robust LEAD FREE brass body. Foundation of a strong, corrosion resistant, durable fitting. Design certified to ANSI/NSF-61 NSF-372 NSF-14 and ASSE 1061 product standard for use in potable water and hydronic heating water distribution. Approved to be used underground and behind walls without access panels. Designed for hydronic heating as well as potable water distribution.