Great one way check valve for aquarium air pump.<br />Durable and easy to install.<br />Fit standard aquarium air pipe of 5mm inner diameter.<br /><br /><br />Non return Valve<br /><br /><br />Preventing Floods in the home<br /><br /><br />Attatch to your airline before the airline enters the aquarium<br /><br />Size: Approx. 5.5cm<br />Material: Plastic<br /><br /><br />Regulator valve *2<br /><img src="http://img6.eachbuyer.com/x9/p100/tgt00690_1.jpg" />