Reduce odor and keep your drain lines flowing free!  Drain dispensing system automatically feeds product into drains and grease traps to break up grease and detergent buildup, and eliminate odors. Model 257B operates on 12VDC plug in transformer or 2 alkaline lantern batteries while model 259B operates on 12VDC plug in transformer only. Pumps once per hour up to 24 times per day. Program is set inside cabinet with easy to use dip switches.