WFU12A-RV Peli Case Wire Feed Units have been designed with increased environmental protection. They are built into a strong, durable plastic case using Zinc coated chassis components to give both great strength and protection when used in damp conditions. Available with a choice of MF33 and MF37 panels that are sold separately. This product is suitable for 12â€Â� wire spools. The WFU12A-RV has auto arc correction ensuring constant arc voltage – displays actual welding voltage and current.