These are LF Brass Certified, have all approvals, easily removable/reusable. Bulk packed for convenience. Designed in California. The Push-Fit connection system is really taking hold. It's the easiest way to join copper, CPVC or PEX pipe in any combination with no soldering, clamps, unions or glue. Just insert the pipe and the stainless steel teeth bite down and grip tight, while a specially formulated O-ring compresses to create a perfect seal. Disassembly is just as fast using the simple disconnect tool. So fittings and valves can be easily changed and reused. 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 LF Brass Certified brass body. Foundation of a strong, corrosion resistant, durable fitting.