1,Can make passing CO2 bubble more uniform and delicate, refurbish refine standard again. 2,Two sizes give you more options, to meet different needs and requirements. 3,U-shaped air inlet port, air pipe does not bend, safe and beautiful, get rid of the air pipe bending around. 4,With bubble counter function, no need to equipped with additional bubble counter to occupy space, bubble counter hole integrated with refiner, can easily judge added CO2 air quantity, can also increase the ornamental value. 5,Made of acrylic material, sturdy, durable and long service life. Condition: Item Type: Bubble Counter Refiner Material: Acrylic Color: Transparent Colour Suitable Range: Water Plants Tanks Size Refiner Height Refiner Diameter Sucker Diameter Suitable Aquarium S 3.8cm or 1.50inch 2cm or 0.79inch 2.2cm or 0.87inch Below 60cm or 23.62inch L 4.1cm or 1.61inch 3cm or 1.18inch 2.2cm or 0.87inch 60-150cm or 23.62-59.06inch 1 x Bubble Counter Refiner 1 x Suction Cup 1 x Sealing Ring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.