Product Overview
The Grundfos 529912 is a pair of bronze threaded union ends for compatible Grundfos UP and UPS circulator pumps that use the GU-125 union connection. The detachable union arrangement allows the pump to be separated from the piping for service or replacement without cutting the connected pipe when the system is correctly installed.
The pair includes two union nuts, two gaskets, and the threaded adapters needed for the listed 3/4 in. NPT pipe connection. Compatibility must be confirmed by the pump’s union standard and connection size rather than by appearance alone. Verify that the pump uses the GU-125 connection and that the system fluid, pressure, temperature, and piping materials are suitable for bronze fittings.
Key Features:
- Pair of bronze threaded union ends
- Designed for compatible GU-125 union pumps
- 3/4 in. NPT pipe connection
- Includes nuts, gaskets, and adapters
- Supports circulator removal and service
Common Uses:
- Installing a compatible UP or UPS union circulator
- Replacing damaged union connection components
- Creating a removable pump-to-pipe connection
Technical Specifications:
- Part Number: 529912
- Union Standard: GU-125
- Pipe Connection: 3/4 in. NPT
- Material: Bronze
- Included: Two nuts, two gaskets, and adapters
Compatibility and Installation Notes:
Confirm the exact circulator model and GU-125 union connection before purchase. Use new gaskets, support the piping, and follow the Grundfos installation instructions when tightening the union assemblies.
FAQ:
Are both union ends included?
Yes. This listing is for a pair with nuts, gaskets, and adapters.
Will it fit any 3/4 in. circulator?
No. The pump must also use the compatible GU-125 union connection.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear product information, helpful support, and convenient online ordering for circulator pumps and connection hardware.
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