Western beam driven chemical pump direct lever drive for higher volumes rated at 0 to 12 quarts per day, 500 PSI with a 3/8" stainless steel head, viton/teflon packing. It's simple--dial in your feed rate & that's it. No other adjustments to make. Complete control in one knob. Set any feed volume from zero to twelve quarts a day--one turn per quart at 15 strokes per minute. Stainless steel plunger & checks for longer life. Interchangeable inlet & discharge checks to simplify maintenance. Double plunger seals with vented isolation chamber to prevent chemical from entering pumpbox. Either rod or cable drive. Line check included with all assemblies.