100% heavy-duty polyethylene construction (pump, tubing, piston). Chemical-resistant for use with acids, bases, detergents, herbicides, and pesticides. Not for use with aggressive solvents. Designed for dispensing water-based products from 20, 35, and 55 gallon containers. Easily attaches to the standard 2" NPT bung on most metal and plastic drums. Screw valve allows user to stop siphon and adjust siphon speed.