innovative push-to-connect design makes for quick and easy installation. Slip feature allows for two inches of rigid copper or CPVC pipe to be cut-out of an existing line and connected back together with the disconnect clip to slide the fitting back-to the other end of pipe. Easily screw-in the expansion tank into the middle FNPT threaded branch after installing the tee into the line. Ideal for working in tight spaces. Faster install time and ease of use reduces installation errors.