Hayward Star-Clear- cartridge filters provide crystal clear water and have extra cleaning capacity to accommodate pools and spas of all types and sizes. For replacement or new pool installations, Star-Clear sets the standard of excellence and value.- Single locking knob securely fastens head to filter tank, eliminating bolts or clamps- Attractive, durable filter head may be rotated to conveniently position pressure gauge and manual air relief- Injection-molded filter tank for dependable corrosion-free performance- Extra-large cartridge element with new precision engineered core provides extra-strength and maximum flow- Elevated, filtered water collector and debris sump prevents accidental by-pass of heavy debris to pool or spa when cartridge is removed for cleaning