Medium-sized walk-behind scrubber dryers – two different drive systems The VIPER FANG 20 and 20 T are medium sized walk-behind scrubber dryers. Through platform design, we can offer these machines at an attractive quality/price level. Simple and easy to use control. The VIPER medium-sized walk-behind scrubber dryers are robust (rotationally moulded housing), reliable and service friendly. With the ergonomic design you can easily see the floors around the machine. You can choose between a pad/brush assist drive system (FANG 20) or a variable speed transaxle drive (FANG 20T). This platform has an on-board charger as standard.