Feature: 1. EXCELLENT APPEARANCE: transparency give superb appearance to your aquarium. 2. 2 SIZE OPTIONAL: tube outer diameter 13mm(suitable for 12mm tube inner diameter of canister filter) and 17mm(suitable for 16mm inner tube diameter of canister filter). 3. WITH SURFACE SKIMMER: The oil slick can be separated, and the oil slick is sucked into the water basket and into the water tube, would not hurt fish and shrimp. The bottom tube 360° rotate design, can control the amount of water of inlet. 4. HIGH BOROSILICATE MATERIAL: Be made of high borosilicate , hand crafted, with high temperature resistance(-30° to 150°) and high transparency, safe and non-toxic. 5. WORRY FREE WARRANTY: Any problem, please contact our store without hesitation. Honor to serve you! Specification: Surface skimmer design, the oil slick can be separated, and the oil slick is sucked into the water basket and into the water tube, would not hurt fish and shrimp. It is easier and contributes to the photosynthesis of aquatic plants. Be made of high borosilicate , with high transparency and high temperature resistance, give superb appearance to your aquarium. Features: EXCELLENT APPEARANCE:transparency give superb appearance to your aquarium. 2 SIZE OPTIONAL:tube outer diameter 13mm(suitable for 12mm tube inner diameter of canister filter) and 17mm(suitable for 16mm inner tube diameter of canister filter). WITH SURFACE SKIMMER: The oil slick can be separated, and the oil slick is sucked into the water basket and into the water tube, would not hurt fish and shrimp. The bottom tube 360° rotate design, can control the amount of water of inlet. HIGH BOROSILICATE MATERIAL:Be made of high borosilicate , hand crafted, with high temperature resistance(-30° to 150°) and high transparency, safe and non-toxic. WORRY FREE WARRANTY:Any problem, please contact our store without hesitation. Honor to serve you! Specification: Name: tube inflow Color: Transparent Main material: High borosilicate Optional size: SIZE S: tube outer diameter: 13MM; Skimmer tube diameter: 22MM; Internal diameter: 40MM; Total height: 290MM SIZE L: tube outer diameter: 17MM; Skimmer tube diameter: 22MM; Internal diameter: 40MM; Total height: 300MM Package Information: Package size: 37.5*15.5*8.5cm Package weight: 325g Gift Box Packaging(with pearl cotton) Note: There could be a few deviation due to manual measurement or slightly color difference as the result of shooting scene. Package List: 1* tube inflow 2* Suction cup Package List: 1* tube inflow 2* Suction cup