Glass Transparent Tube Inflow with Surface Skimmer for Plants Aquarium Canister Filter Inflow Glass Tube Outer skimmer Glass lily pipe spin surface inflow outflow 13/17mm aquarium water plant tank filter Fish Tank Filter Inflow Pipe Glass Inflows are designed to transport the water from the aquarium to the external canister filter. This simple design glass pipe has suction slits. For use with a frame-less aquarium tank. Due to its slit form, it have advantage of not to suck in the withered leaves easily. This improves water circulation. But please make sure to remove the leaves stuck on the suction slits. These pipes are made by glass. This is transparency so it does NOT disturb the appearance of aquarium and it is suitable for water plant layout because of good water current for it. Outflow Pipe This outflow pipe bringing clean water from the filter backto aquarium. Moderate water circulation evenly within the aquarium is essential to maintain the water quality and prevent algae appearance. However excessively strong out flow of the power filter works negatively, hindering healthy growth of aquatic plants. Lily Pipe Outflow is hydro-dynamically designed to create a moderate circulation of water within the aquarium ideal for the growth of aquatic plants. Usage Sliding Lily Pipe Outflow above the waterline allows it to also serve as an aerator which eliminates oily surface film. Also you can prevent deficiency of oxygen during the night. Specification: Name: Glass tube inflow Color: Transparent Main material: High borosilicate glass Optional size: SIZE S: Glass tube outer diameter: 13MM; Skimmer tube diameter: 22MM; Internal diameter: 40MM; Total height: 195MM SIZE L: Glass tube outer diameter: 17MM; Skimmer tube diameter: 22MM; Internal diameter: 40MM; Total height: 195MM Note: There could be a few deviation due to manual measurement or slightly color difference as the result of shooting scene. Package List: 1* Glass tube inflow