Feature:<br /><br />\u25cfSmall and compact.<br />\u25cfBrand new one way check valve.<br />\u25cfIt's easy to install.<br />\u25cfMade of durable plastic.<br />\u25cfGreat one way check valve for aquarium air pump<br />\u25cfCompatible with standard aquarium air pipe of 4mm inner diameter.<br />\u25cfProtect you air pump by preventing aquarium water from back siphoning during a power outage.<br /><br />Product Attributes: <br /><br />Material:Plastic<br />Color: Red<br />Quantity: 1 Pcs<br />Full Length(approx.): 45mm x 15mm x 4mm<br /><br /><br />Package Include:<br /><br />1 x One Way CO2 Check Valve<br /> <br />Note:<br /><br /><br />1.Due to the light and screen difference， the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid.<br />2.Please allow 1-5mm differences due to manual measurement.