AppliaFit Union Replacement Kit for Pentair SuperFlo & SuperFlo VS Pumps — 2-Pack, 2" Thread / 1.5" Glue Adapter, Durable

AppliaFit’s Union Replacement Kit is a direct-fit, heavy-duty union assembly designed to replace Pentair SuperFlo and SuperFlo VS pump unions (part numbers 350157 and 351157).

This union kit from AppliaFit gives you a durable, dual-fit connection that works with many Pentair SuperFlo, SuperFlo VS, SuperFlo VST and SuperMax VS pumps manufactured before 11/02/2020. It’s built for longevity and designed to accommodate either 2" external pump ports or a 1.5" glued pipe inside the adapter, making it a flexible solution for repairs and upgrades without replacing your pump.

How does this union fit different Pentair SuperFlo pump models?

The AppliaFit union is engineered as a 2-in-1 adapter: its nut threads onto pumps with 2" external ports while the adapter’s center accepts a glued 1.5" pipe. It’s compatible with a wide list of Pentair model numbers and alternate part references, so you can match this kit to older equipment with confidence.

• Threads onto 2" external ports common on many SuperFlo pumps.
• Inner adapter accepts 1.5" pipe for direct glue installation.
• Fits SuperFlo, SuperFlo VS, SuperFlo VST and SuperMax VS (pre-11/02/2020).
• Works with listed Pentair model numbers and alternate part #s.

Will this union kit withstand pool and spa conditions?

This replacement union is made from heavy-duty materials chosen to resist regular pool and spa environments, including exposure to water and chemicals. While materials are robust, follow standard installation and maintenance to ensure long-term performance.

• Constructed from durable polymers for corrosion resistance.
• Designed for repeated assembly and disassembly during maintenance.
• Packaging may vary but the functional components remain consistent.

How easy is installation for the average pool owner?

Installation is straightforward for anyone familiar with pool plumbing basics: thread the union nut onto 2" pump ports or glue a 1.5" pipe into the adapter hub. No specialized pump-specific tools are required, but using proper glue and ensuring a clean mating surface will create a secure, leak-free connection.

• Thread-on connection for 2" pump ports—no glue required for that configuration.
• Glue-in option for 1.5" pipe—use recommended solvent cement for PVC plumbing.
• Replace single union per pump with the supplied kit; two kits included in the 2-pack configuration.

What compatibility checks should I make before purchasing?

Confirm your pump model and port size to ensure this union matches your equipment—many SuperFlo units use 1.5" ports, while others have 2" external threads. Cross-reference part numbers and manufacturing dates (pre-11/02/2020) if you have a SuperMax or variable-speed model.

• Verify pump model and manufacturing date (SuperMax VS compatibility noted pre-11/02/2020).
• Check whether your pump has 1.5" or 2" ports before installation.
• Compare alternate part numbers (e.g., 21063-350-000, PAC-101-0157) if available.

Who is this for? AppliaFit’s union replacement kit is tailored for pool and spa owners, maintenance pros, and service technicians who need a reliable, flexible replacement for worn or damaged Pentair SuperFlo-style unions. If you maintain older Pentair SuperFlo, SuperFlo VS, SuperFlo VST or SuperMax VS pumps and want a sturdy, easy-to-install union that accepts both 2" external ports and 1.5" glued pipe, this kit provides a practical, cost-effective repair option.