The 661 Blend Safe Series offers safety and security when it is necessary for gallon bottles to be self contained inside the dispenser and stainless steel is required. Two different 1 products systems are available with either a single 1 gpm (4 liters / min.) fill or dual fill with 1 gpm (4 liters / min.) and 4 gpm (15 liters / min.). A 4 product system is also available with 3 bottle fill and 1 bucket fill ports. Models include either Action Gap or Air Gap backflow protection.