Grundfos 529912 — 3/4″ Bronze Union Threaded End Pair for UP/UPS Pumps

Grundfos 529912 — 3/4″ Bronze Union Threaded End Pair

The Grundfos 529912 fits GU-125 union pumps (UP/UPS family), providing a reliable connection point with 3/4″ NPT threaded ends. This pair includes nuts, gaskets, and adapters to make installation or replacement straightforward.

Key Features & Benefits

• Pair of bronze half unions compatible with GU-125 union pumps 
• Includes nuts, gaskets, and adapters for direct installation 
• 3/4″ NPT threaded connection ensures broad compatibility 
• Ideal for use when replacing or upgrading circulator piping
• Durable bronze construction resists corrosion and wear

Applications

• Replacement or repair of UP / UPS series circulator pump unions
• Hydronic heating and domestic hot-water systems using GU-125 unions
• Any piping system needing detachable union ends for serviceability

Specifications

A dependable bronze union pair for service, repair, or replacement — keep your circulator connections solid and serviceable.

Grundfos GU 125 Bronze Union Flange
Includes two nuts, gaskets and adapters
Compatible with Grundfos UP and UPS pumps with 125 Union
3/4" NPT connection