The MRCOOL Flare to 3/8 Weld Fitting for Universal Series is a useful accessory for connecting the refrigerant lines of your MRCOOL Universal Series heat pump or air conditioner. This fitting allows you to convert the standard flare connection on the outdoor unit to a 3/8-inch weld connection, which is more durable and less prone to leaks. The fitting is made of high-quality brass and comes with a rubber gasket for a tight seal. The installation is easy and requires only a few tools and some brazing skills. Here are the steps to install the MRCOOL Flare to 3/8 Weld Fitting for Universal Series:

1. Turn off the power to the outdoor unit and disconnect the refrigerant lines from the flare connections.
2. Remove the flare nuts and washers from the refrigerant lines and set them aside.
3. Cut off the flare ends of the refrigerant lines with a tubing cutter, leaving enough length to reach the weld fitting.
4. Clean and deburr the cut ends of the refrigerant lines with sandpaper or a wire brush.
5. Slide the weld fitting over the refrigerant line and align it with the flare connection on the outdoor unit.
6. Apply flux to both ends of the weld fitting and the refrigerant line.
7. Heat the weld fitting and the refrigerant line with a torch until the flux melts and bubbles.
8. Touch the brazing rod to the joint and let it flow around the weld fitting and the refrigerant line, forming a smooth and even bead.
9. Repeat steps 5 to 8 for the other refrigerant line.
10. Let the joints cool down and check for leaks with soap water or a leak detector.
11. Reconnect the refrigerant lines to the outdoor unit and tighten the flare nuts with a wrench.
12. Turn on the power to the outdoor unit and test its operation.

The MRCOOL Flare to 3/8 Weld Fitting for Universal Series is a simple way to enhance the performance and reliability of your MRCOOL Universal Series system. It is compatible with all models of MRCOOL Universal Series heat pumps and air conditioners, as well as other brands that use flare connections. With this fitting, you can enjoy a more secure and leak-free connection for your refrigerant lines.