🔧 What this part is
Waterway Plastics Tailpiece, 2"bt x 2"s,for Split Nut, part number 417-5050. The split nut clamps a union or heater connection together and is the part that usually cracks or seizes.
Size as listed: 2".
✅ Check before you order
- Measure the part you are replacing – this one is listed as 2".
- The number on the old part should read 417-5050, or the maker’s equivalent.
- Not sure? Send us a photo of the old part and any number on it, and we will tell you whether this is the one.
🔧 Exploded diagram and parts
This part belongs to the Hydro-Quip HeatMax Electric Pool & Spa Heater, 5.5kW/11.0kW assembly. Everything listed below is something we stock for it, and the numbers match the diagram.
| No. | Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|---|
| 2 | ![]() |
Hi-Limit, 5/16" dia, 12"Capillary, SPST, Screw Terminal, 25A | 275-3290-00 | Available to order | $64.51 | |
| 6 | ![]() |
Tecmark Pressure Switch 3902 | 3902 | 96 in stock | $33.66 | Add to cart |
| 7 | ![]() |
Hydro-Quip Heater Manifold Snap Nut 42-0007B | 42-0007B | 35 in stock | $7.04 | Add to cart |
| 8 | ![]() |
Waterway O-Ring/Gasket 711-4030 | 711-4030 | 4402 in stock | $0.73 | Add to cart |
| 10 | ![]() |
Reducer Bushing Fitting 437-251 – 2"SPG x 1-1/2"S | 437-251 | 779 in stock | $5.02 | Add to cart |
| 14 | ![]() |
Hydro-Quip Knob 48-0013 | 48-0013 | 2 in stock | $11.18 | Add to cart |
Parts that go with this
| Part | Our part number | Availability | Price | ||
|---|---|---|---|---|---|
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Silicone Based Lubricant 1oz 00150 | 00150 | 343 in stock | $5.26 | Add to cart |
![]() |
Waterway Gasket 711-4010 | 711-4010 | 1201 in stock | $1.92 | Add to cart |
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Silicone, DOW 732, 3oz Tube, Clear | DC-732-CLR-3 | 186 in stock | $17.88 | Add to cart |
















