Air pump aquarium control air water flow lever valve is the best choice for fish tank and aquaculture applications. Lever valve let you operate it easily. This lever valve can be used for aquarium, hatchery and aquaculture applications. Stainless Steel Aquarium switches regulatordurable. Anti-Rot, anti-high pressured, anti-acid and alkaline. Suitable for CO2 supplying system. Good for supplying system and air pump. Air pump tubing switcher provide switch to control the air flow rate. Let you use only one pump to support multi tanks. Fit 4mm air tubing. Package Content : 2 x Aquarium Air Valve