2” Male Thread NPT High Heat Union
Product Overview
Molded from heat-stabilized resin to eliminate the thread shrinkage and suction leaks common on pump ports.
Standard schedule 40 PVC fittings begin softening around 140°F, leading to thread distortion and air leaks at the pump intake and discharge. Praher Plastics molds this 2-inch male NPT union from high-temperature composite material capable of enduring elevated operating temperatures and dry-run friction. It threads directly into 2-inch female pump ports and provides a true-union disconnect for equipment removal without cutting pipe.
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Benefits & What Makes It Different
Thermal Distortion Resistance
Maintains structural rigidity under friction heat from low-flow or dry-run events, preventing thread ovalization.
Quick-Disconnect Union Nut
Permits full pump extraction for motor service or winterization without cutting into rigid plumbing lines.
Precision 2-Inch NPT Machining
Molded male pipe threads engage cleanly into pump volutes to create an airtight seal under vacuum.
Compatibility
- 2-inch female NPT threaded pump volutes (Hayward, Pentair, Jandy, Waterway)
- 2-inch Schedule 40 or Schedule 80 PVC slip pipe
When To Use This
Pro Tip
Thread the union into the pump hand-tight, then advance no more than 1 to 1.5 turns with a strap wrench. Over-torquing tapered male threads can crack the pump's female volute regardless of fitting strength.
Common Questions & Instructions
Why use a high heat union instead of a standard PVC male adapter?
Generic Schedule 40 PVC softens and shrinks at approximately 140°F. When a pump runs dry or encounters head pressure, water temperatures spike quickly, drawing air past deformed threads. High-heat composite fittings maintain seal tension beyond 180°F.
What thread sealant is recommended for this Praher union?
Apply a non-hardening, PTFE-based pipe paste specifically labeled safe for pool plastics, or 4 to 5 wraps of heavy-duty PTFE thread tape. Avoid industrial solvent-based pipe dopes that degrade plastic threads.
How often does the internal union O-ring need replacement?
Inspect and re-lubricate the elastomer O-ring with silicone grease at least once per season. Replace the O-ring every 2 to 3 years, or immediately if pinched, flattened, or cracked.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
