advantage: 1.BG20592 flange standard, can be customized according to demand 2. Bearing box mirror processing, installation without deformation, double life 3. Thickened HT200 bottom plate, no solder joint in one, tensile resistance 200Mpa 4. V-type water retaining ring, no friction, improve unit efficiency 5.RF surface sealing, sealing effect is better 6. Copper motor, strong power, safe and efficient