These A and F Machine Product Pumps (helwig pumps) are ideal for use in chemical feed to boilers, waste water treatment, the pulp and paper industry and related applications where a controlled volume of chemical treatment is required. These heavy duty piston metering pumps are built for minimum maintenance from quality materials. Output flow rates are up to 120 Gallons per hour and output pressure are up to 1000 PSI depending upon model. The V-7 piston pump is a compact unit designed for lighter metering applications. Nova-Tech International sells series V-10 pumps, V-5 pumps, and V-7 pumps (reciprocating piston/plunger, positive displacement chemical metering pumps) A&F Piston Pumps and A&F Parts.