The K9000 Twin provides two Standard Tubs which share a single controller. Ideal for busy sites. You can wash more dogs in a smaller footprint and wash twice the dogs in the same time as one unit. No more waiting for customers with plenty of tubs available. The Twin has great visual impact and better ROI than 2 units. The Twin is ideal for indoor/unsupervised public use and fits all sized dogs. This machine needs to be operated in an environment which is at least 5 degrees c. Winterization is required if leaving outside in winter months.