The 12mm Ista Quick Release Double Tap Connector is ideal for use when performing maintenance on multiple features of your aquarium set up. The dual ball valve, quick release unit can be connected to various hoses from filters, return lines and pumps, and will effectively stop the flow of water with the flip of the switch, allowing for hassle free cleaning and maintenance with minimal water spillage during disconnection and reconnection. Features positive barb retention so tubing will not slip and disconnect during use.