Size:1-1/4'' x 3/4" The 1-1/4-inch x 3/4-inch copper solder coupling reducer is used in residential and commercial systems such as potable water, air conditioning and refrigeration. The 1-1/4 inch x 3/4 inch coupling reducer features solder cups. The fitting provides a means of connecting larger size tube to smaller size tube. In addition to its inherent qualities of beauty, durability and low maintenance, copper¡¯s reusability makes it an ideal application in sustainable projects