This union has a nut that fits on pumps with a 94 mm outside diameter thread (this type of thread is known as 2.5-inch MBT), and connects to 2-inch pipe.
It is suitable for use with several brands of pump, including Waterway (mostly Executive), LX Whirlpool, Aqua-Flo ITT/HydroAir and Balboa.
If the nut breaks, you can replace it with a two-part nut that is screwed together, and therefore perfect for repairs when you need to avoid cutting pipe.
The o-ring is provided.
Inside diameter of the union thread : 90 mm or 2.5-inch FBT
Inside diameter smooth side: 60 mm, for 2-inch pipe
Outside diameter of the corresponding male thread on the pump: 94 mm