The Waterway hot tub pump union 400-5990 has threads referenced as 2.5” with an actual inside diameter of 3-11/16” and a 2" slip end. The slip end of this union is designed to fit over a fitting with a 2” spigot end or schedule 40 PVC pipe or flex hose referenced as 2” with an actual outside diameter of 2-3/8”. It's important to note that in the pool and hot tub industry, plumbing dimensions are referred to as nominal sizes rather than actual sizes.
Details:
- Waterway P/N: 400-5990
- Brand: Waterway Plastics
- Threads: 2.5", (Actual ID 3-11/16")
- Connection: 2" Slip
- Colour: White
- Material: PVC
- Includes O-ring
Pump Union Sizes.
Measure the Inside Diameter "ID" of your current "CLOSED" split nut or regular nut.
If it measures:
- 2-7/16" then you need a 1-1/2"
- 3-1/16" then you need a 2"
- 3-11/16" then you need a 2-1/2"
