In accordance with the needs of users, we produce storage hopper, and fluid bath, storage fluid bath, shutter devices, such as liquid and equipment. fluid bath, storage fluid bath, and then flap fluid filter specifications by supporting the production, can be based on user preservative, such as the different requirements of acid-resistant, custom-made carbon steel, stainless steel, polypropylene and other materials to meet the needs of users. The plate is divided into upper flap over liquid and flip-down, flip-down takes up liquid and then liquid derivative material type options.