ISTA 16mm Quick Disconnect Fits 16/22mm Hose. : Use this handy
ball valve for low-pressure applications like canister filters,
pump return lines, and more. Positive barb retention and
connection. Easy adjust valve control. For 16/22mm piping (16mm
internal diameter, 22mm outer diameter) Ideal for maintenance of
aquarium filters and pumps. Allowing quick disconnection and
reconnection to the filtration/pumping system with minimal water
spillage.