This 3/4" x 3/4" straight copper coupling is from Quick Fitting. It is a push-to-connect fitting meaning it installs in seconds on copper, PEX, PE-RT, and CPVC. The fitting is removable and reusable. No glue or flames are required. Certified lead-free. Quick Fitting part number CH821R.
EC Part Number: #19221
Manufacturer Number: CH821R
Manufacturer: Quick Fitting