This S75x6 adapter must be screwed directly onto the thread of your bottle. Without the original valve. Only for Schütz, Fustiplast und Clawson IBC containers. You have a choice of Stainless steel, PE-HD (HDPE) or PP (Polypropylene) manufactured adapters with a built-in seal. If you are in any doubt about the right screw thread, email photos of your valve/bottle to email@example.com We will be happy to assist you.