Oversized strainer basket and volute - industry standard in pool pumps Compatible with all cleaning systems, various filters and jet action spas New motor increases life, energy, efficiency, ease of installation and better cooling for long service life CA Residents, this product is not in compliance with New Department of Energy (DOE) Regulations Online part number EC-015583 is the direct replacement for part number 011580 We call it the WhisperFlo® High Performance Pump for good reason. This innovative hydraulic design moves water more efficiently and more quietly than competitive pumps. Under typical operating conditions, the WhisperFlo pump offers the highest water flow of any high performance pump—yet with the lowest electricity consumption. And, the WhisperFlo pump is designed to be a tireless workhorse. Its engineered thermoplastic housing withstands extreme heat and resists corrosion. Unique FunnelFlo diffuser and high-efficiency impeller maximize water flow and energy efficiency while minimizing turbulence and noise. Energy-efficient motor with commercial-grade frame, rustproof stainless steel shaft, and permanently lubricated, sealed bearings for long life. The commercial grade motor frame has a rustproof, stainless steel motor shaft and sealed bearings that never need lubrication. Engineered to provide optimum performance in any size pool or pool and spa combination, the WhisperFlo pump is built to last a lifetime, and as a result, has become the industry’s top seller for years. Features: CA Residents, this product is not in compliance with New Department of Energy (DOE) Regulations The WhisperFlo pump costs less to operate, because it uses less horsepower to produce required water flow Specially-engineered design assures whisper-quiet operation as documented in rigorous ETL tests Oversized strainer basket extends time between cleanings See-through lid makes inspection fast and easy—engineered polymer remains clear and strong for years The user-friendly Cam and Ramp™ Lid is easy to remove and quickly locks in place with a quarter-turn Standard and Energy-efficient Square Flange Motors available Lower HP's deliver higher performance than industry standard Compatible with all cleaning systems, various filters and jet action spas Heavy-duty/durable construction is designed for long life Designed for residential and commercial applications New motor increases life, energy, efficiency, ease of installation and better cooling for long service life