This pump union fits most models of hot tub massage pump with a 2" exit, including those manufactured by Waterway, LX Whirlpool, Aqua-Flo ITT/HydroAir and Balboa. It comes with its o-ring.
The union nut is also available as a spare part.
This union does not fit pumps manufactured by Espa or Davey Spa Power.
Inside diameter of the union thread: 75 mm
Outside diameter of the corresponding male thread on the pump: 78 mm
Connects to 2" pipe (outside diameter: 60 mm)