Product Overview

The Pentair 2" x 2" PVC Union with O-Ring | 473381 is a genuine Pentair replacement plumbing union designed for compatible Pentair pool and spa heater and heat pump systems.

This union provides a secure, serviceable connection between pool plumbing and compatible heater or heat pump ports. The included O-ring helps create a leak-resistant seal, making it useful for replacing cracked, worn, leaking, missing, or damaged union fittings.

The 473381 union is commonly used with compatible Pentair UltraTemp, ThermalFlo, ThermalFlo Titanium, and MiniMax Plus pool and spa heat pump applications.

Ideal For

• Pentair UltraTemp heat pump plumbing repairs
• Pentair ThermalFlo heat pump applications
• Pentair ThermalFlo Titanium heat pump applications
• Pentair MiniMax Plus heater / heat pump applications
• Replacing leaking heater unions
• Replacing cracked or worn PVC unions
• Pool heater inlet and outlet plumbing connections
• Heat pump service and maintenance
• Professional pool equipment repairs
• Equipment pad plumbing replacements

Key Features

• Genuine Pentair replacement union — designed for compatible Pentair heater and heat pump systems.
• 2" x 2" PVC union fitting — supports compatible 2" pool plumbing applications.
• O-ring included — helps provide a secure, leak-resistant seal.
• Serviceable plumbing connection — allows easier heater or heat pump removal and maintenance.
• Compatible with select Pentair heat pumps — commonly used with UltraTemp, ThermalFlo, ThermalFlo Titanium, and MiniMax Plus systems.
• Durable PVC construction — built for pool and spa equipment pad plumbing environments.
• OEM fit and function — designed to match supported Pentair equipment ports.
• Helps prevent water leaks — replaces worn, warped, cracked, or damaged unions.
• Simple replacement part — practical solution for routine heater plumbing repairs.
• Professional-grade pool part — ideal for service technicians and equipment installers.

Benefits

The Pentair 473381 union helps restore a tight, reliable plumbing connection on compatible Pentair heater and heat pump systems. A damaged or worn union can cause water leaks, air entry, poor seal pressure, and service issues around the heater connection.

Replacing the union with the correct OEM part helps maintain proper flow through the heater or heat pump while keeping the equipment easy to disconnect for future maintenance. The included O-ring supports a proper seal without needing to replace the entire heater manifold or plumbing assembly.

For pool professionals, this is a practical replacement part for heater service calls, equipment pad repairs, and Pentair heat pump plumbing maintenance.

Specifications

Included Components

• 1 × Pentair 2" x 2" PVC union
• 1 × O-ring seal

Heater, heat pump, manifold, unions for additional ports, plumbing pipe, PVC cement, valves, adapters, gaskets, and installation labor are sold separately unless specifically included by the supplier.

Compatibility Notes

This union is designed for select Pentair heater and heat pump plumbing applications.

Common compatibility references include:

• Pentair UltraTemp pool and spa heat pumps
• Pentair ThermalFlo heat pumps
• Pentair ThermalFlo Titanium heat pumps
• Pentair MiniMax Plus heat pump / heater applications
• Compatible heater and heat pump ports requiring Pentair part 473381

Always confirm the equipment model, plumbing port size, union style, O-ring size, and part diagram before ordering. This union is not universal for every Pentair heater or pump.

Installation Notes

This union should be installed by a qualified pool professional. Turn off all pool equipment and relieve system pressure before removing or replacing any plumbing fitting.

Inspect the heater port, existing union nut, tailpiece, O-ring groove, threads, and surrounding plumbing before installation. Lubricate the O-ring only with a pool-safe lubricant if needed. Do not overtighten the union, as overtightening may damage the fitting or seal.

After installation, restart the system and inspect for leaks under normal operating flow and pressure.

Customer-Facing Q&A

Q: What is the Pentair 473381 used for?
A: It is a 2" x 2" PVC union with O-ring used on compatible Pentair heater and heat pump plumbing connections.

Q: What is the SKU?
A: The SKU is 473381.

Q: What is the UPC / GTIN?
A: The UPC / GTIN is 788379698102.

Q: What is the distributor product number?
A: The distributor product number is PUR-151-3381.

Q: What size is this union?
A: This is a 2" x 2" PVC union.

Q: Does this include the O-ring?
A: Yes. This union includes the O-ring seal.

Q: What material is it made from?
A: It is made from PVC / polyvinyl chloride.

Q: What equipment does it fit?
A: It is commonly used with compatible Pentair UltraTemp, ThermalFlo, ThermalFlo Titanium, and MiniMax Plus heat pump applications.

Q: Is this a pump union?
A: It is primarily listed as a heater / heat pump union. Always confirm your equipment part diagram before ordering.

Q: Can this fix a leaking heater connection?
A: Yes, if the leak is caused by a worn, cracked, damaged, or missing union or O-ring. The heater port and plumbing should also be inspected.

Q: Should this be professionally installed?
A: Professional installation is recommended to ensure proper fit, sealing, and leak-free operation.