Photo #1. This item is Universal Air Conditioner (UAC) Part FT1972. At one horizontal end is a #6(3/8”) O-ring and 5/8”-18 male thread. The opposite end is the same, except female. The female port in the center is 3/8”-24. It accepts the adapter shown in Photo #2.

Photo #2. This item is Santech Part MT1607. Its purpose is to accept a female threaded pressure switch. The smaller end is 3/8”-24 male, and threads into UAC Part FT1972. The larger end is M12-1.5 male and will accept any one of several different switches. The larger end has a Schrader valve within it.

Photos #3 and #4 show the two parts assembled.

Photo #5 shows exactly what the buyer will receive.