Swimables SW-21-350 Pump Union Kit 2" for Pentair SuperFlo & SuperFlo VST
Key Benefits + Pump Plumbing Fitment
- Swimables replacement pump union kit for Pentair SuperFlo and SuperFlo VST pool pumps
- Part number SW-21-350 helps customers match the correct aftermarket union kit
- Designed as a replacement for Pentair 350157-style SuperFlo union kits
- Includes the union components needed for pump plumbing connections
- 1-1/2 inch internal slip x 2 inch external slip connection style
- Allows the pump to be removed for service without cutting plumbing
- Helps restore secure plumbing connections when the original unions are cracked, leaking, damaged, or missing
- Useful when replacing or reinstalling a Pentair SuperFlo-style pump on an equipment pad
Quick Product Summary
The Swimables SW-21-350 Pump Union Kit is an aftermarket 2-inch pump union kit designed for Pentair SuperFlo and SuperFlo VST pool pumps. It replaces Pentair 350157-style union kits and provides the plumbing connection between the pump and pool equipment pad piping. Use this kit when the original pump unions are cracked, leaking, missing, or when you need serviceable unions that allow the pump to be removed without cutting plumbing. Public product listings describe SW-21-350 as a SuperFlo-style union kit with 1-1/2 inch internal slip x 2 inch external slip connections and two unions with adapters, nuts, and O-rings.
Best For
- Pentair SuperFlo pool pumps
- Pentair SuperFlo VST / variable speed pool pumps
- SuperFlo-style pump plumbing repairs
- Replacing cracked, leaking, or missing pump unions
- Equipment pad service where pump removal may be needed later
- Pool owners matching Swimables SW-21-350 or Pentair 350157-style fitment
Why This Matters
- Pump unions allow the pump to be disconnected without cutting plumbing
- Damaged unions can cause leaks at the pump inlet or outlet
- Missing or mismatched unions can make pump installation difficult
- Correct union sizing helps prevent plumbing alignment and sealing issues
- O-rings help create a proper seal when installed correctly
- Matching the pump model and union style helps avoid wrong-part orders
Common Signs You Need This / Use This When
- Use this union kit when the existing pump unions are cracked, stripped, leaking, or missing
- Use this replacement when reinstalling a compatible Pentair SuperFlo or SuperFlo VST pump
- Common signs may include water leaking at the union nut, damaged threads, or worn O-rings
- Replace the union kit when old fittings no longer tighten or seal properly
- Use this kit when your pump requires a Pentair 350157-style union replacement
- Verify the pump model and plumbing size before ordering
Product Specifications
| Specification | Details |
|---|---|
| Brand | Swimables |
| Product Name | Pump Union Kit 2" for Pentair SuperFlo & SuperFlo VST |
| Part Number / SKU | SW-21-350 |
| UPC / Barcode | 810055610350 |
| Product Type | Pool pump union kit |
| Replacement Style | Pentair 350157-style union kit |
| Connection Size | 1-1/2" internal slip x 2" external slip |
| Common Fitment | Pentair SuperFlo and SuperFlo VST pool pumps |
| Additional Common Fitment | SuperFlo VS and select SuperMax applications when verified |
| Included Components | 2 adapters, 2 union nuts, and 2 O-rings, based on public SW-21-350 listings |
| Application | Pool pump inlet and outlet plumbing connections |
| Use | Allows pump connection, disconnection, service, and replacement without cutting plumbing |
| OEM / Genuine Status | Aftermarket Swimables replacement part |
Compatibility / Fitment Notes
The Swimables SW-21-350 is designed as a SuperFlo-style union kit for Pentair SuperFlo pump applications. POOL360 lists SW-21-350 as a Swimables union kit for Pentair SuperFlo pumps, and multiple product references identify it as a direct replacement for Pentair 350157.
Public listings for Pentair 350157 describe the connection size as 1-1/2 inch internal slip by 2 inch external slip and list the kit as including adapter, nut, and O-ring components. Some Swimables listings also include Pentair SuperMax compatibility, but you should verify your exact pump model, plumbing size, and existing union style before ordering.
Do not assume this kit fits every Pentair pump, IntelliFlo pump, WhisperFlo pump, Challenger pump, Sta-Rite pump, or non-SuperFlo pump unless your parts diagram or existing union setup matches the 350157 / SW-21-350 style.
Installation / Use Notes
Turn off power to the pool pump and relieve system pressure before servicing plumbing connections. Drain the pump housing as needed and confirm the pump cannot start while you are working on the equipment pad.
Dry-fit the union components before gluing or tightening anything permanently. Make sure the O-rings are seated correctly, the union nuts thread smoothly, and the plumbing is aligned without forcing the pump ports. Do not overtighten union nuts, and follow proper PVC cementing and local plumbing practices when connecting to pool plumbing.
Buy with Confidence
Benchmark Pool Supply helps customers match pool pump parts by model, part number, plumbing size, and real-world installation needs. Pump unions are small parts, but they matter because the wrong union can create leaks, poor alignment, or future service headaches. We focus on clear product identification so customers can match Swimables SW-21-350 to the correct Pentair SuperFlo or SuperFlo VST pump application.
