Description
Product Overview
The Grundfos 519601 Cast Iron Flange Set is engineered for UP and UPS series circulator pumps, offering a robust solution for connecting pumps to piping systems. This set includes two flanges, two gaskets, and two bolts with nuts, all designed for a secure 3/4-inch NPT pipe connection. The flanges feature a GF 15/26 pump connection and a compatible groove diameter of 15 millimeters, ensuring precise fit and reliable performance. Made from durable cast iron with a no-finish design, this set resists corrosion and wear, making it suitable for long-term use in residential and commercial applications. Specifications include a 0.75-inch item diameter, 3/4-18 thread size, and a lightweight construction at 0.01 ounces per item, facilitating easy handling and installation.

Usage
This flange set is ideal for use with Grundfos Versa Flo UP and UPS circulator pumps in various environments, including home heating systems, hot water recirculation, and commercial HVAC applications. It is commonly installed by HVAC technicians, plumbers, and DIY enthusiasts in settings where reliable pump connections are critical, such as in basements, mechanical rooms, and industrial facilities. The threaded fittings provide enhanced security, reducing the risk of leaks and ensuring stable operation in systems that require consistent water flow and pressure.
Why Choose Us
Grundfos is a trusted manufacturer known for high-quality pump components, and this flange set reflects their commitment to durability and precision. The cast iron construction offers superior strength and resistance to environmental factors, while the exact compatibility with UP series pumps minimizes installation errors. With a 4.6-star rating from over 377 customer reviews and a top rank in water pump accessories, this product delivers proven reliability and ease of use, backed by decades of industry expertise.
Key Features
- Compatible with Grundfos Versa Flo UP and UPS circulator pumps for seamless integration
- Includes two flanges, two gaskets, and two bolts with nuts for complete installation
- 3/4-inch NPT pipe connection with threaded design for secure, leak-resistant fittings
- Durable cast iron material with no finish, ensuring long-lasting performance in harsh conditions
- Lightweight and easy to handle, simplifying setup for professionals and DIY users alike
FAQ
What pumps is this flange set compatible with?
This set is designed for use with Grundfos Versa Flo UP and UPS series circulator pumps, providing a GF 15/26 pump connection for optimal fit.
Does the set include all necessary components for installation?
Yes, it includes two flanges, two gaskets, and two bolts with nuts, covering everything needed for a standard pump connection.
What is the pipe connection size?
The flange set features a 3/4-inch NPT pipe connection, which is standard for many residential and commercial water circulation systems.
Is the material resistant to corrosion?
The cast iron construction with no finish offers good resistance to rust and wear, making it suitable for moist or demanding environments.
Can I use this for DIY projects?
Absolutely, the lightweight design and included components make it user-friendly for DIY enthusiasts, though basic plumbing knowledge is recommended for proper installation.




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