JARDLI Plant Aquarium Glass Poppy Pipe Outflow and Lily Pipe Inflow Make an elegant curve line in the box-shaped aquarium. Glass transparency give superb appearance to your aquarium. 13mm diameter fit for the hose of 12/16mm. Deliver clean water from the filter with appropriate water flow speed. Package Included: 1x Poppy pipe outflow, 1x Lily pipe inflow, 4x Suction cups