Its a tank i dont know capacity but it holds alot, and vapes well. Its made from a hard plastic from a company that sent me a free sample, very thick and strong. I used a 5/8" o.d. beveled gasket flipped upside down, to fit the provari. The gasket fits so tight so no leaks. The top is a flat 5/8 gasket with the cut ce2 tube and mouth piece, Its one of a couple I have made. Just sharing this one: Dont mind the cell phone pic

