CX900DA Pool Filter Knob is a compatible replacement for Star Clear Plus knobs used on C751, C900, and C1200 cartridge filter systems. It is designed for medium-sized pools. - Benefits: Restores reliable filtration by ensuring the knob operates smoothly, preserving proper valve alignment and cycle performance. - Compatibility: Fits the standard Star Clear Plus cartridge assemblies C751, C900, C1200 for a secure, easy replacement. - Build and performance: Durable construction for outdoor pool use, delivering dependable filtration and stable system operation. - Water quality: Helps maintain clear, healthy water by enabling efficient filtration. Use scenarios: - Replacing a worn, cracked, or hard-to-turn knob during routine maintenance. - Upgrading aging components to prevent filtration downtime in a medium-sized pool. - Servicing rental properties or pool installations where quick, dependable parts minimize downtime.