Description
The Grundfos 00529912 is a Bronze Union Adapter Set designed for use with compatible Grundfos circulator pumps in hydronic heating and cooling systems. Featuring 3/4″ NPT threaded connections, this adapter set simplifies pump installation and future serviceability by allowing the circulator to be quickly disconnected and reconnected without disturbing the surrounding piping.
Key Features
- Bronze construction for excellent corrosion resistance and long service life
- 3/4″ NPT threaded connections for compatibility with standard hydronic piping
- Union-style design enables fast, tool-friendly pump removal and reinstallation
- Engineered to pair with Grundfos circulator pumps for a secure, leak-free seal
- Ideal for residential and light commercial hydronic heating applications
Application
This union adapter set is the recommended accessory for Grundfos circulators requiring 3/4″ NPT connections. The union design eliminates the need to cut or re-solder piping during pump maintenance or replacement, reducing downtime and labor costs. Bronze material ensures compatibility with both open and closed hydronic systems.
Product Specifications
- Brand: Grundfos
- SKU / Part Number: 00529912
- Material: Bronze
- Connection Size: 3/4″ NPT
- Connection Type: Union (threaded)
- Application: Hydronic circulator pump installation









