Explore a selection of circulator pump couplers and impellers at F.W. Webb. A coupler connects the pump and motor shafts together on a circulator, driving power to the unit for optimal performance. Choose the right coupler from the start to reduce the chance of a system failure; a compatible model will support your pump and ensure longevity. The impeller rotates in a circulating pump to move fluid through the unit. Made in cast iron, lead-free brass, steel, and rubber, the pump coupling and impellers in our collection are durable enough for everyday use in your residence or business. Use the convenient filters on our site to narrow the search for water pump couplings and impellers by size, product type, and maker. We carry top-quality circulator pump couplers and impellers from trusted brands, including Bell & Gossett and Taco, so you can find the right component for your circulator.