Waterway 2-In Split Nut with Screws Heater Part 400-5421

Heater Part: 2 Inch Split Nut 400-5421 with screws made by Waterway Plastics.
Note: Not for spa pumps, only for heaters.

When measuring for a split nut replacement for your heater tailpiece, measure the inside diameter of the current "unsplit" nut (regular nut). 

• 2-7/16" actual diameter uses a 1 1/2" split nut 
• 3-1/16" actual diameter uses a 2" split nut (this one)
• 3-3/4" actual diameter uses a 2 1/2" split nut

These are compression nuts with 2 screws for heater tailpieces.

Heater split nuts are different than pump split nuts - this one is for a heater.

This part 400-5421 is same as 610266 and 400-5161. It's a 2 inch heater split nut with 2 screws included.

We also offer gaskets:

Heater gasket 711-4030  with integrated raised o-ring on one side and flat on the other (most popular)

Flat gasket 711-4010

Tailpiece if needed is 417-5050