10X Plastic Fish Tank Water Flow Control Valve Hose Tube Connector Aquarium 4mm This item is for 10pcs. Specification: please check it carefully before making a purchase. 4.0mm: interface diameter 4mm, length 37.5mm, height 17.5mm, fits hose inner diameter 3mm-4mm Material: plastic Color: random (black or blue) Package: 10pcs SKU: BAY-A050