417-5160 Spa Heater Union Tailpiece 2" Spigot, 1 per pack 3.1" OD threads. 1.9" inside diameter socket for 1-1/2" pvc pipe. Outside diameter is the same as 2" schedule 40 pvc pipe, which is 2-3/8" OD. So the male portion mates with 2" pipe size, and the female is for 1-1/2" pvc pipe size.

Sold as a single tailpiece with one o-ring. OD of threads measure 3.065"

417-5160, 4175160, 89-270-1070, 42-0017-k