Compatibility: 1/4\" or 1/4\" Hose Connections: This vacuum skimmer adapter fits most Summer Waves pools - compatible with 1/4\" or 1/4\" hose connections on RP or RX filter systems and existing floating pool skimmer adapters. Warning: Not suitable for index inlet ports. High Quality: Our Summer Waves vacuum skimmer adapter is made of durable PVC and is well-made. It comes with two O-rings for a tighter connection, allowing your skimmer to operate at maximum efficiency. [The 3/4\" diameter internal thread connects to the pool's suction port, and the smaller diameter with two O-rings connects to a 1/4\" or 1/4\" hose.] Easy to Install: The RP/RX skimmer vacuum adapter can be easily installed. Simply screw this adapter onto the pool's suction housing, and you'll have a vacuum adapter ready to use. Pool Cleaning Accessory: This skimmer accessory improves the cleaning performance of your pool vacuum by allowing it to connect directly to the skimmer basket. By utilizing the suction power of the skimmer system, it effectively removes debris from the pool surface, keeping it clean and inviting. With this RP/RX skimmer accessory, you can streamline your pool cleaning routine.