["Features:\r\nbrand new and high quality.\r\nCO2 system is designed for low cost planted for tank use\r\nEasily set up/low cost/excellent quality\r\nThis bottle cap is very well suitable to be DIY Co2 system’s accessory that the size fits common PET plastic bottle.\r\nThe composition is used as special high quality plastic for issuing great resistibility of rub, so it can be used for a long for time.\r\nAs for the another advantage of specific, we attached the great quality plastic O ring inside of the cap to prevent missing the Co2.\r\nEasy set up, excellent disign.\r\nIt's worth to try and using it.\r\n　\r\nSpecifications:\r\nMaterial: ABS\r\nColor: (shown as the pictures)\r\nSize: (As picture shows)\r\n Inside diameter: Approx 27.5mm/1.08\"\r\nQuantity:1PC (No retail package)\r\nNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!!!\r\nCompare the detail sizes with yours, please allow 1-4CM differs due to manual measurement, thanks!\r\nPackage includes:\r\n1PC X Bottle Cap"]