The utility model discloses a novel subassembly is fixed to pre -buried spout, it relates to building materials apparatus for producing field, it contains the die block panel, the positioning screw, fixation nut, disc spring, lock nut, pre -buried spout and plastics gland, the surface of die block panel be provided with with positioning screw matched with through -hole screw thread, this through -hole screw thread welding has fixation nut, fixation nut sets up the bottom at the die block panel, the below that the lower extreme of positioning screw is located fixation nut is provided with disc spring and lock nut, die block panel and pre -buried spout and plastics gland fixed connection are passed to the upper end of positioning screw, pre -buried spout setting is in the top of die block panel, and the laminating is fixed each other. Its structural design is reasonable, and the installation is simple, and convenient to use is workable, not only can realize section of jurisdiction steel mould and pour the concrete section of jurisdiction of pre -buried spout and the concrete section of jurisdiction of nos pre -buried spout, has improved service function moreover, has effectively reduced the processing cost, clearance easy maintenance, and the section of jurisdiction steel mould of being convenient for is maintained and is maintained.