This adapter is designed to connect 15mm copper pipe, 15mm Speedfit pipe, and HEP20 pipes to a 3/8" connection, commonly used for fridge water filters. It features a simple push-fit connection for easy installation. Once connected to your main water supply, you can attach the second 3/4" - 1/4" adapter. The Speedfit and push-fit nature of these connections makes installation incredibly straightforward.