These copper press adapters feature press x thread connection- tying together traditional plumbing with the latest in plumbing technologies for copper tubing. These fittings feature an easy and effective way to join K, L, or M copper tubing. No more hose, thread cutter, gas, solder, or flux necessary. Allows to join wet connections, making it the fastest solution for maintenance and repair. Also great for keeping installation on or ahead of time due to rapid installation. It's a safe and economical option for copper pipeline installation systems in above or below ground applications as allowed by local code. All tubing used with these fittings should comply to ASTM B75 or ASTM B88 standard. Adaptable for any commercial, residential, or industrial application- whether new or reconstructed. 0-250 degrees Fahrenheit operating temperature range. Complies to NSF international, UPC/IAPMO, CSA international, CRN, MASS approval, JNS Group-ISO 9001 / 14001 approved company. Maximum operating temperature 200 PSI. Requires a licensed installer to ensure quality installation and avoid potential damage and hazards. ⚠ California Proposition 65 Warning: This product is known to the state of California to cause cancer, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.