3/8" x 3/8" x 1/4" CxCxC Tee 

Copper Tees are copper fittings with three ends. Copper Tee Descriptions = (end) x (end) x (middle). Therefore a 3/4" x 1/2" x 3/4" Copper Tee has 3/4" on one end, 1/2" on the other end, and 3/4" in the middle. These Copper Fittings come in many different sizes.