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Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4 NPT
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Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4 NPT
Grundfos Cast Iron Flange Set is compatible with Grundfos UP Series Circulator Pumps and includes (2) flanges, (2) gaskets and (4) bolts and nuts.
Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT
Item #: 12540587

Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT

88% of respondents would recommend this to a friend

Item #: 12540587

BTN 3661

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Grundfos Cast Iron Flange Set is compatible with Grundfos UP Series Circulator Pumps and includes (2) flanges, (2) gaskets and (4) bolts and nuts.
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What Stands Out

Durable Material
Constructed from high-quality cast iron, ensuring longevity and resistance to wear, making it suitable for demanding circulating pump environments.
Easy Installation
Designed for hassle-free installation with seamless compatibility with UP Series circulator pumps, saving time and effort for users during setup.
Reliable Performance
Engineered to deliver consistent performance and efficiency, addressing user concerns of pump reliability while enhancing overall system functionality.

Product Details

Shop the best selection of Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps on Ubuy Bhutan. Get fast and reliable shipping worldwide.
Brand NameGrundfos
Number of Pieces8
Model Number519603
Global Trade Identification Number00632514024649
ManufacturerGrundfos
Set NameGrundfos UP Series Circulator Pumps Flange Set (2 Flanges, 2 Gaskets, 4 Bolts and Nuts)
Unit Count1 Count
UPC632514024649 735090478179
Included ComponentsGrundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT
Item Type NameGrundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT
Manufacturer Part Number519603
Size379
Item Dimensions8 x 4 x 6 inches (20.3 x 10.2 x 15.2 cm)
Item Weight1.2 pounds (540 grams)
Connector TypeNPT
Thread Size1-1/4" NPT (289.6 cm)
Thread TypeNPT
ColorBlack
Material TypeCast Iron
MaterialCast Iron
BrandGrundfos
Item dimensions L x W x H8 x 4 x 6 inches (20.3 x 10.2 x 15.2 cm)

Who Should Buy?

Suitable For
  • Plumbing Professionals

    Ideal for plumbers needing reliable and durable flange materials for circulator pump installations and replacements.

  • HVAC Contractors

    Perfect for HVAC contractors requiring robust fittings for heating system components in residential and commercial buildings.

  • DIY Enthusiasts

    Great for DIY homeowners looking to replace or install circulator pumps with quality parts for optimal performance.

Not Suitable For
  • Non-Plumbing Users

    Not suitable for individuals without plumbing knowledge, as improper installation could lead to performance issues.

Product Description

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the Grundfos 519603 Cast Iron Flange Set made of?

    Answer: The Grundfos 519603 Cast Iron Flange Set is constructed from durable cast iron, which offers excellent strength and corrosion resistance. This high-quality material is essential for maintaining the structural integrity of heating systems. Cast iron is commonly used in plumbing and heating applications because it can withstand high temperatures and pressures, making it an ideal choice for circulator pump installations. Use this flange set in heating systems to ensure reliable performance in residential or commercial settings.
  • Question: What pumps are compatible with the Grundfos 519603 Flange Set?

    Answer: The Grundfos 519603 Flange Set is specifically designed for compatibility with UP Series Circulator Pumps. This means it will seamlessly fit models within that series. Ensuring compatibility is crucial, as using the wrong flange can result in leaks or improper functioning of the pump system. Whether you are replacing an old flange or installing a new pump, this set will help maintain optimal operational efficiency in your heating system.
  • Question: How do I install the Grundfos 519603 Flange Set?

    Answer: Installing the Grundfos 519603 Flange Set involves a few straightforward steps. First, ensure that the pump and surrounding pipework are properly isolated. Align the flanges with the pump openings, and secure them using the appropriate bolts. Tightening these bolts evenly is critical to prevent future leaks. This flange set provides a solid connection between the pump and the piping system, ensuring efficient fluid transport without disruptions. For those familiar with home improvement, this setup can significantly enhance your heating system’s reliability.
  • Question: Can the Grundfos 519603 Flange Set be used for outdoor applications?

    Answer: Yes, the Grundfos 519603 Cast Iron Flange Set can be used in outdoor applications, provided that it is installed correctly and protected from the elements. Cast iron is robust and can handle varying temperatures, but it’s advisable to apply protective coatings or enclosures to minimize exposure to moisture and harsh weather, which can lead to rust. Use this flange in outdoor heating systems or installations where exposure is minimal, making it suitable for patios or external heating units.
  • Question: What are the dimensions of the Grundfos 519603 Flange Set?

    Answer: The Grundfos 519603 Flange Set features dimensions specifically designed for UP Series Circulator Pumps, with a 1-14 NPT size that allows for optimal connection to standard piping systems. This size ensures it fits correctly with the corresponding pump, facilitating a secure seal for efficient operation. The standardized dimensions make it easy to find compatible piping and fittings, ensuring hassle-free installations in various heating configurations.
  • Question: Is the Grundfos 519603 Flange Set suitable for high-pressure applications?

    Answer: Yes, the Grundfos 519603 Flange Set is suitable for high-pressure applications, as it is designed to handle the demands of circulator pumps. Cast iron can withstand significant stress, making it ideal for systems that require reliable performance under pressure. Using this flange set in systems such as hydronic heating or water circulation enhances the system's efficiency and longevity. It’s particularly beneficial for commercial installations, where pressure fluctuations are common.
  • Question: What color is the Grundfos 519603 Flange Set?

    Answer: The Grundfos 519603 Flange Set is finished in a classic black color, providing a sleek aesthetic that blends well with most heating systems. This neutral shade not only adds a professional appearance but also helps to hide marks and rust, ensuring that the installation remains visually appealing in viewable areas. Its design is not just functional but also supports the overall style of your heating setup, regardless of whether it’s for a home or commercial space.
  • Question: What is the purpose of a flange set in a circulator pump system?

    Answer: A flange set in a circulator pump system serves the critical function of connecting the pump to the piping system. It creates a secure seal that prevents leaks while allowing for proper flow and pressure management. This connection is vital for the efficiency of heating systems, as it ensures that hot water circulates effectively through radiators or heat exchangers. Using a quality flange like the Grundfos 519603 helps maintain optimal performance and longevity of your heating system.
  • Question: What maintenance is required for the Grundfos 519603 Flange Set?

    Answer: The Grundfos 519603 Flange Set requires minimal maintenance, but regular inspections can help ensure long-term performance. Periodically checking for leaks and ensuring the bolts remain tight is essential to prevent issues. If other components of the heating system are being serviced, inspect the flange for signs of wear or corrosion. Addressing minor issues early can save on bigger repair costs later. This proactive approach will help maintain the efficiency of the circulator pump system over time.
  • Question: Where can I buy the Grundfos 519603 Cast Iron Flange Set?

    Answer: You can purchase the Grundfos 519603 Cast Iron Flange Set from Ubuy in Bhutan. Ubuy provides a convenient platform for acquiring high-quality plumbing components, including this flange set, to ensure your heating systems run smoothly. With their user-friendly interface, it's easy to find and order the exact products you need for your syste.

Grundfos Pump Accessories 519603 Editorial Review

The Grundfos 519603 Cast Iron Flange Set is a reliable accessory for UP series circulator pumps. It is made of durable cast iron material and has a size of 1-14 NPT. This set is essential for a heating system and ensures compatibility with the desired pump. However, there is some confusion about the sizing, as the picture is misleading, and a customer received the 1 1/4" flanges instead of the 3/4" flanges they needed. Overall, Grundfos is a trusted brand for heating systems, and this accessory is a must-have for proper installation.

Customer Reviews & Ratings

24 customers ratings
  • 5 Star
    78%
  • 4 Star
    7%
  • 3 Star
    11%
  • 2 Star
    0%
  • 1 Star
    4%

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Pros

  • Durable cast iron material
  • Compatible with UP series circulator pumps
  • Trusted brand for heating systems

Cons

  • Picture is misleading

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8 September 2026 · via Trustpilot
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BTN 3661

Order now and get it around Tuesday, September 22

QTY:

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Features & Benefits

  • Compatible with Grundfos UP Series Circulator Pumps
  • Durable cast iron material
  • Includes (2) flanges, (2) gaskets and (4) bolts and nuts
  • NPT end connections
  • Fitting Size: 1-1/4"
  • Check manufacturer recommendations to ensure a proper fit

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