NIKOLay CO2 Regulator-Aquarium Check Valve Regulator Aquarium CO2 Check Valve Aquarium System-Double Head Silver

Product description: When using, just unscrew one end and fill the bubble counter with water, or if you prefer a bright solution to make it easier to read, you can use it.This transparent aluminum bubble counter is designed in the shape of a typical bubble counter and is a proven design; accurate bubble counting can be obtained without the need for bulky and expensive equipment. ??Material:Aluminum alloy ??Size:Approximately 2.95inch in length, approximately 0.79inch in diameter, error approximately 0.39inch ??Package Including: 1pc ???Notice: 100% Satisfaction Guarantee: If you have any problems on our products,please feel free to contact us at any time.