AppliaFit Union Kit for Pentair SuperFlo Pumps — 2-Pack, 2 in threaded and 1.5 in glued adapter, durable

AppliaFit’s Union Replacement Kit provides a durable, dual-function union for Pentair SuperFlo, SuperFlo VS and compatible SuperMax pumps, allowing either 2" threaded connection or a glued 1.5" pipe insert.

This replacement union kit (fits part numbers 350157 and 351157) is built to restore a secure, leak-resistant connection between your pump and plumbing. Manufactured from rugged materials for long-lasting service, the adapter works with a broad range of Pentair SuperFlo models as well as earlier SuperMax VS and related variable speed pumps made before 11/02/2020. The kit is supplied as a two-pack so you can replace both unions at once or keep a spare on hand.

Which pumps and part numbers will this union kit fit?

This kit is designed for Pentair SuperFlo and SuperFlo VS family pumps plus many SuperMax VS units produced before the date listed. Alternate part numbers commonly referenced by technicians are also covered.

• Compatible with Pentair SuperFlo & SuperFlo VS model lines (examples included below)
• Fits pumps with part numbers like 342001, 342002, 340036–340044 and similar SuperFlo models
• Also fits SuperMax VS and VST models manufactured prior to 11/02/2020
• Cross-reference: 21063-350-000, 350157, 626500, PAC-101-0157, CMP21063350000

How does the 2-in-1 fitting work with different pipe sizes?

The union features a two-function design: the outer nut threads onto pumps with 2" external ports, while the center of the adapter accepts a glued 1.5" PVC pipe. That versatility means you can match either common factory pump ports or existing 1.5" plumbing without buying a separate reducer.

• Threaded nut for direct 2" pump ports
• Inner socket accepts glued 1.5" PVC pipe
• Eliminates the need for extra reducers or adapters in many installations

What materials and durability features does the union provide?

AppliaFit constructs the union from heavy-duty materials formulated to resist routine pool chemicals and mechanical stress. The result is a reliable seal and longer service life compared with brittle or low-grade replacements.

• Reinforced polymer for strength and chemical resistance
• Precision threads and gasket seat for a tight, leak-resistant connection
• Two-piece kit design for simple removal and re-installation

How easy is it to install this replacement union kit?

Installation is straightforward for homeowners and pool pros alike: remove the old union, clean mating faces, hand-thread the nut or glue the pipe into the center as required, and tighten to seat the seal. No specialized tools are necessary beyond common plumbing supplies.

• Remove old union, inspect O-ring and seat
• Thread nut onto 2" port or glue 1.5" pipe into adaptor center
• Hand-tighten and test for leaks after filling the pump housing

Who is this for: Pool owners, maintenance professionals, and repair shops that service Pentair SuperFlo, SuperFlo VS, and compatible SuperMax pumps will find this AppliaFit union kit useful. It’s ideal when you need a dependable replacement that accommodates either 2" threaded pump ports or 1.5" glued plumbing, and the two-pack format helps complete dual-side replacements or keeps a backup on hand.