1. Compatible with Multiple Models: Works with Model 8939, 8939G, 8939A, 8939AG, 8940, 8940G, and 89401. This replacement vacuum plate and lowprofile adapter arc are specifically designed for HydroTools skimmers, offering a wide range of functionality for various pool cleaning systems. 2. Complete Replacement Set: The package includes both a vacuum adapter plate and a lowprofile vacuum arc, providing all the components for effective pool maintenance without requiring additional purchases, making your cleaning routine simple and hassle. 3. Versatile Hose Compatibility: The vacuum arc accommodates vacuum hoses with diameters of 1.5 inches, allowing easy connection to your existing pool cleaning equipment without the need for extra adapters. 4. Easy Installation: The yellow plastic construction offers lightweight yet durable performance, with a design that ensures quick and effortless replacement, so you spend less time on maintenance and more time enjoying your pool.