Dr. Joel Kaplan Premium Pumper’s Lube. Dr. Kaplan’s genuine water-based lubricant is recommended for use with all of our official pump systems. It is specially formulated for use on the penis and scrotum, helping to provide a perfect seal during pump sessions. Does not erode cylinders or pump hardware. Easy clean up. Official Dr. Joel Kaplan product. Will not stain. 16 oz. pump.