New Rola-Chem Pool Sentry M-3000 Automatic Pool Filler - Automatic Water Leveler for Swimming Pools and Ponds | M-3000 Features and Benefits: Automatic Water Leveling: Maintains your pool, spa, or pond water level unattended and automatically, preventing pump burnout and ensuring optimal water level even when you're away Easy Setup: Assembles in seconds with no tools required, simply snap together two parts and thread in the valve assembly, then attach to a garden hose Portable Design: Completely portable, making it ideal for use in various pool types, ponds, or spas, and can be easily moved or stored when not in use Adjustable Float: Allows you to set the desired water level, usually halfway on the tile line or skimmer, ensuring your pool's water level is always where you want it Heavy-Duty Construction: Built to last with a durable plastic body and a weighted bag filled with rocks or pea gravel to keep the unit secure on the deck