GRUNDFOS - FLANGE KITS FOR UNION MOUNTED PUMPS (Models, UPS15-35SUC/LC/DT, UPS15-55SUC/LC/DT) bronze union sweat fitting set

The Grundfos 529913 Bronze Union Sweat Fitting Set is a genuine connection kit designed for Grundfos union-mounted circulator pumps, including UPS15-35SUC and UPS15-55SUC series models. Manufactured from durable bronze, this union connection set provides a reliable sweat connection between the circulator pump and copper piping in domestic hot water recirculation and hydronic heating systems. The kit includes bronze union fittings, flange adapters, sealing O-rings, and installation hardware for a secure, leak-resistant installation. Ideal for residential and commercial plumbing applications, the bronze construction offers excellent corrosion resistance and long service life while simplifying pump installation and future servicing.

Cross References

• Grundfos — 529913 (1/2" Bronze Union Sweat Fitting Set)
• Grundfos — 529912 (3/4" Bronze Threaded Half-Union Connection Set)
• Grundfos — 519850 (1/2" Bronze Union Set with Integrated Check Valve)

Usage

The Grundfos 529913 Bronze Union Sweat Fitting Set is used to connect compatible Grundfos union-mounted circulator pumps directly to copper piping using sweat (solder) connections. It is commonly installed on domestic hot water recirculation systems, residential hydronic heating systems, boilers, and light commercial HVAC applications. The union design allows the circulator pump to be removed for maintenance or replacement without cutting or modifying the connected copper piping, making servicing faster and reducing installation time. Bronze construction provides excellent corrosion resistance in closed-loop and potable water circulation systems.