The Waterway EX2 4 HP 2-Speed Main Pump (Model 3721621-1W) delivers powerful, efficient water circulation for larger residential spas and hot tubs. This 230V pump operates at 12.0/4.4 amperage with a reliable 56Y frame design, providing the high-flow performance needed for multi-jet systems and enhanced hydrotherapy features.
Built with Waterway's proven EX2 wet end technology, this OEM-grade pump features 2-inch male buttress thread connections for secure plumbing integration. At Bubbles Supply, we guarantee this pump is the exact fit for your spa with same-day shipping and our comprehensive 1-year warranty backing every purchase. Professional installation is recommended due to electrical requirements and proper plumbing alignment—always verify your existing pump's model number and electrical specifications before ordering to ensure seamless replacement.