... design, protection grade IP55, class F inslution.3.motor for matte paint appearance paint, environmental protection and ... V-ring as standard on DE rotor shaft for motor with FS80-FS132, and oil seal as option ... ; Oil seal as standard for motor with FS160 and above.16. Anti-condensation heater ... a half key22. Drain plug on FS160-355 motor as standard23. Ribbed end shields for better bearing ...