The Taco Pro-Fit IMP-C-100 is a universal impeller with a 4.25" diameter. It features a brass key insert that provides added strength and stability. This impeller is designed for use with open or closed systems and even with cast iron or bronze pumps as well. Made of Noryl material, this universal impeller also offers durability and ensures years of reliable service. It fits the Bell & Gossett and Armstrong pumps. Taco is a company that produces plumbing and HVAC products ranging from pipes, fittings, parts, and more. By providing residential, commercial and as well as industrial plumbing solutions, Taco has created a wide variety of products to choose from. Here at PlumbersStock, customer satisfaction is our greatest goal. We strive to obtain the best quality products like this one and offer them at a relatively low price. PlumbersStock offers a range of products like faucets, toilets, plumbing supplies, and much more!