Specifications: Material:PVC Color: Black Grey Size: Suitable for pipe size of outside diameter 16mm x Inner diameter 12mm Features Brand New and high quality. Ideal for fixing aquarium water pipe A good helper for changing water and pumping water. Fits for 0-52mm thickness of the fish tank glass, do not occupy space. Suitable for pipe size of outside diameter 16mm x Inner diameter 12mm Usage: 1.Connect the water pipe to both ends of the water inlet and water outlet (just connect the water inlet), slide the control valve to fit the thickness of the fish tank glass, and fix the connector to change the water 2.The curved connector removed, then the water pipe into the circular port, sliding control valve to fit the glass thickness of the fish tank, fixed connector, you can change the water Package included: 1 Pcs Aquarium Hose Holder(NOT INCLUDED HOSE) Notice: Please allow 1-3mm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.