Product Description: The carbonation cap is highly effective method to add and maintain carbonation in beverages for extended periods of time. The in-built 5/16" Bart can attach 5/16" ID tubing and a 0.5 micron carbonation stoneto attach on the end with the portability of being able to move the cap from bottle to beer bottle. Product Advantages : Stainless steell make it last forever. Compared with the traditional bottling, kegging, and home seltzer machines, save more time and money Simple to use, fill a standard 2L bottle with homebrew (or liquid), attach the cap and CO2 system, and shake. Carbonating home brew has never been easier! Use a standard plastic bottle and this carbonation cap for an easy and effective carbonation process. Shipping 1.If you need to buy in bulk, please contact, we will reply in 24 hours. 2.We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. 3.Usually product Reaches after about 12-45 business days depending on destination. If you have not received your shipment within 45 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Refund or resend product will be offered if item still not received. 4.We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We ask you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them!