Grundfos pumps offer the pinnacle of reliability and performance for a large variety of water circulation applications. From home hydronic circulation to large scale commercial water movement, Grundfos has a pump that will provide years of trouble-free service. The UPS15-58FRC is a three speed circulator with an integrated flow check valve, limiting water flow to a single direction. Solid cast iron construction guarantees years of reliable performance with minimal maintenance needs, while hardwire electrical connection design allows the pump to tap directly into your home's electrical supply. Product Features Durable Cast Iron Construction The Grundfos UPS15-58FRC is crafted from cast iron, which gives the pump both extended lifespan and protection against corrosion. Whisper Quiet Operation The UPS15-58FRC pump runs quiet even at high flow levels, ensuring the pump won't distract you from your work or disrupt your sleep.