Feature:<br /><br />\u25cfThis bottle cap is very well suitable to be DIY Co2 system's accessory that the size fits common PET plastic <br /> bottle.<br />\u25cfThe composition is used as special high quality plastic for issuing great resistibility of rub, so it can be used for a long time. <br />\u25cfAs for the another advantage of specific, we attached the great quality plastic O ring inside of the cap to prevent <br />  missing the Co2<br />\u25cfDIY, Getting Basic, Easy set up, Simply, Cool, Low Price, Hard, Excellent design<br /> <br />Product Attributes: <br /><br />Material:ABS plastic<br />Color:As the picture shown<br />Quantity: 1 Pcs<br />Size: Diameter:2.85cm<br /><br />Package Include:<br /><br />1 x Bottle Cap<br /> <br />Note:<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.