overall sealed pump, size of the rod material is 45 #, we rough after quenching and tempering, and then plate hard chromium after finishing the surface in order to improve the wear resistance. we use overall spool, it is easy to keep maintenance. the sealed parts are imported, so it greatly extended life, and lower the maintenance costs. fork is used welding sheet metal stamping and molding, and make it keep higher strength and rigid， the front of fork is precise castings, good bull, it can avoid of affecting the overall performance due to deformation.