Bottle Cap Assembly, 38mm, Polypro with Stainless Steel Band, 1/8OD Tubes, Connects 2 Bottles together. Has a Filter on the dip tube in the first bottle, to transfer liquid from the first bottle to the second bottle passing it through the filter on the dip tube of the first bottle. Includes 1/4-28 tube nuts and ferrules on the 2 each 1/8 inch OD tubes. One tube is to connect to a gas source. The second tube is to send liquid to your system.