1. Improved pool cleaning: Replacement vacuum plate and flat adapter elbow for skimmer tools, designed to boost cleaning efficiency by improving suction and flow during routine maintenance. 2. Wide compatibility: Works with model 8939, 8939G, 8939A, 8939AG, 8940, 8940G, 89401, and is compatible with a broad range of pool skimmers. 3. Flexible connection and size: The vacuum elbow is designed to fit vacuum hoses with a diameter of 3.8 cm, enabling easy connection to your existing pool cleaning equipment. 4. Use scenarios: - Replace worn parts in older skimmer setups to restore suction and cleaning performance. - Upgrade a pool cleaning system to fit multiple skimmer models in a household with multiple pools or configurations. - Seasonal maintenance: swap in the replacement plate and elbow to maintain efficient cleaning without replacing the entire unit.