【Used for】Used for aquarium and aquaculture applications. Air lever valve can be connected to aquarium tubing. 【Control】Control the flow of vital O2 from your pond aerator or aquarium air pump with this air lever valve. convenient air control. 【Package Content】20 x Air Flow Control Valve; Product Name: Air Flow Control Valve 【Suitable for】Suitable for connecting with 4mm hose, to control the volume of oxygen pump outlet.Ideal accessories for volume adjustment of the aquarium oxygen pump. 【Material】Made of premium plastic material, it is durable and beautiful. Can adjust the amount of air pump at any time. Easy to use, convenient and practical to use. utilize.