According to the product assembly requirements

first pre-drilling thread bottom hole

tapping and milling surface in the tube union required by the drawing

and make the galvanized thread plug at the same time

the thread plug is screwed into the tube union as a tube assembly

and then put it into the casting mold.The tube dimensions of the casting would be achieved directly by the die casting process through die-casting mould precision limit insert.When the die casting is complete

remove the recyclable thread plug.The galvanized thread plug can prevent effectively metal from rust caused by the high temperature and oil of the fitting surface between the tube union and the thread plug to ensure the cleanliness requirement

and protect the tube surface against damage.The internal thread of the tube union ensure the tooth shape in the thread plug force in the die casting process

so as to achieve the purpose of directly by the die-casting process.Reduce the cost under the precondition to satisfy the production requirements.