ESAB Field Conversion of PWC-4 Control (PWM-4) for use with Customers Power Supply allows you to convert your PWC-4 Control to work with your own power supply. This conversion kit includes everything you need to make the switch, including an ammeter, rotameter scale, ball float, shield gas switch, switch nameplate, switch kit harness, fuses, fuse decals, rubber bumper, and PT-12 torch. With this conversion, you'll be able to use your PWC-4 Control with any power supply that meets the specifications of the kit.