Description: Glass transparency give superb appearance to your aquarium. Make an elegant curve line in your aquarium. 2 size for selecting: Outer Dia. 13mm and Outer Dia. 17mm 13mm diameter fit external canister filter hose size of 0.47 inches (12mm), 17mm diameter fit external canister filter hose size of 0.63 inches (16mm) Deliver clean water from the filter with appropriate water flow speed Easy to remove, when it time to clean your tank. Can be installed on the aquarium with using a suction cup Specification: Material: High Borosilicate Glass Size 1#-S: Total Height: approx. 180mm/7.09 inches; Pipe Inner Dia. 9mm/0.35 inches; Pipe Outer Dia. 13mm/0.51 inches; Cup Dia. 48mm/1.89 inches Size 1#-L: Total Height: approx. 190mm/7.48 inches; Pipe Inner Dia. 13mm/0.51 inches; Pipe Outer Dia. 17mm/0.67 inches; Cup Dia. 55mm/2.17 inches Size 2#-S: Total Height: approx. 180mm/7.09 inches; Pipe Inner Dia. 9mm/0.35 inches; Pipe Outer Dia. 13mm/0.51 inches; Cup(LxW): approx. 53x47mm/2.09x1.85 inches Size 2#-L: Total Height: approx. 190mm/7.48 inches; Pipe Inner Dia. 13mm/0.51 inches; Pipe Outer Dia. 17mm/0.67 inches; Cup(LxW): approx. 66x62/2.60x2.44 inches Color: Clear Package Includes: 1 Piece Tank Outflow Lily Pipe 2 Pieces Suction Cup (1#-S only have 1 suction cup) Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item