Description
Product Overview
The 350157 Union Kit for Pentair SuperFlo Pool & Spa Pumps — with Gasket | iFJF is a precision-engineered replacement part designed to restore proper function and stop leaks in your pool or spa equipment. Manufactured to meet or exceed OEM specifications, this component delivers reliable, long-lasting performance at a fraction of the dealer price.
Pool equipment operates in a harsh environment — constant exposure to chlorinated water, UV radiation, temperature swings, and pressure cycles. When seals, O-rings, and internal components degrade, the result is leaks, poor filtration, and higher operating costs.
Key Features
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OEM-Spec Precision: Manufactured to exact dimensional tolerances for guaranteed fit without modifications.
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Chemical-Resistant Materials: EPDM, Viton, or chemical-grade polymers resist degradation from chlorine, bromine, salt, and UV.
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Extended Service Life: Premium materials deliver 2-3x the service life of economy alternatives.
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Easy DIY Installation: Straightforward replacement with basic hand tools — most jobs take 15-30 minutes.
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Value Pack Savings: Multi-pack options available — stock up and save vs buying singles when applicable.
Compatibility
| Specification |
Detail |
| Brand |
Pentair Pool & Spa |
| Replaces Part # |
350157, SW-21-350, 21063-350-000 |
| Material |
EPDM Rubber / Engineered Polymer |
| Application |
Residential & Light Commercial Pool/Spa |
When to Replace
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Visible Leaks: Water seeping from connections or housings = failed seal or gasket
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Decreased Performance: Reduced flow, poor filtration = worn internal components
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Unusual Noise: Grinding or squealing = worn bearings, gears, or impellers
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Age: Rubber seals should be replaced every 2-3 years as preventive maintenance
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Hard/Cracked Rubber: O-rings that feel hard or show surface cracks no longer seal properly
Installation Tips
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Turn Off Equipment: Switch off at circuit breaker before working on pool equipment.
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Release Pressure: Open air relief valve on filter to release system pressure.
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Clean All Surfaces: Remove old gasket material and debris — clean surface = proper seal.
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Use Proper Lubricant: Silicone-based pool lube only. NEVER use petroleum jelly — it destroys EPDM.
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Tighten Evenly: Cross-pattern tightening for multi-bolt connections.
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Test Before Full Operation: Run briefly and check all connections.
Frequently Asked Questions
Q: Does this fit my SuperFlo VS pump?
A: Yes. Fits all Pentair SuperFlo pumps: VS (variable speed), single-speed, two-speed, and high-performance models. Replaces OEM part numbers 350157, SW-21-350, and 21063-350-000.
Q: What is included in the kit?
A: One 2-inch union connector nut (threaded half), one 2-inch union tailpiece (slip half), and one EPDM gasket/O-ring. Single union set for one pump port. Most SuperFlo pumps need two kits (suction and discharge).
Q: How do I stop my pump from leaking at the union?
A: Common causes: 1) Over-tightening crushes gasket (hand-tighten + 1/4 turn only) 2) Old hardened gasket (replace every 3 years) 3) Misaligned pipe stress (support plumbing within 12 inches of pump) 4) Cracked union nut from freeze damage or overtightening.
Q: Can I install without cutting plumbing?
A: If replacing existing same-type union: yes. Unscrew old nut, swap gasket, reconnect. If tailpiece (glued half) needs replacement, you will need to cut and re-glue PVC pipe using primer and cement rated for pool/spa applications.
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