I see your samples of certificate , they are all for co2 cylinder and regulator , one is TPED for Europe market , one is DOT for American market. These safe certificate is the precondition for the co2 cylinder and regulator to these two market. But It's different with our kegs, our kegs related and precondition is sanitary. This year we finished NSF certificate approved for our beer tap tower for American market, but the cost is very very expensive around USD10,000 per year.