Neptune hydraulic diaphragm, chemical metering pumps are commonly used in the process and agricultural industries. These pumps are available for low and high pressure applications with either manual or electronic stroke control. The newest of these pumps is the Series 500 "dia-pump" with automatic air release valve; all Series 500 pumps are designed to give valve checks extra time to seat and provide simplex capacities from 1 to 18 gph at up to 1,100 psi (Series 500A and E), or 0.2 to 80 gph at 3,000 psi (500S and D). The company also sells several models of fertilizer and chemigation pumps and electronic pumps, as well as glycol, bypass, and bromine feeders and chemical feed systems.

Pacer Pumps offers nine series of pumps for different industrial applications, such as agriculture, marine, and construction. The S Series features self-priming, chemically resistant centrifugal pumps for general service on water, salt water, waste water, mild acids, and bases. All of these pumps include a built-in check valve, and offer a choice of materials (polyester, polypropylene, or Ryton) and drives (electric motor, gasoline driven, hydraulic driven, or pneumatic driven), with flow rates to 280 gpm. Many of the same choices are available for the I and G Series self-priming centrifugal pumps. Other options include the T Series for solids handling and PC Series for transferring or recirculating acids, plating solutions, etc., as well as magnetic coupled, vertical, drum, and hand operated pumps.

Price Pump Company is a manufacturer of centrifugal and air operated diaphragm pumps for industrial applications and OEM users. They offer five models of magnetically driven centrifugal pumps with flows up to 400 gpm and heads up to 320 ft, and 13 models of close-coupled centrifugal pumps. The company also manufactures multi-stage, pressed stainless steel centrifugal pumps in horizontal and vertical configurations, which both support pressures up to 142 psi. Air operated diaphragm pumps are also available from 0.25" to 3" inlet/outlet, with metallic and non-metallic designs.

Weir Minerals sells a variety of pumps, starting with Begemann Pumps' BS pump, a single entry, vertical, inline, close-coupled pump that is compliant with the latest API 610 guidelines and designated to BS4082 Class R. Crankshaft options for the chemical and fertilizer industries include the ZPR, a 1- or 2-cylinder double-acting piston pump, and the TZP, a 3-cylinder, single-acting piston pump. Several horizontal slurry pumps and hydraulic driven piston pumps are also available through Weir.

Wilden specializes in air-operated double-diaphragm pumps. Their King Cobra Series peristaltic pumps are industrial, self-priming hose pumps meant for transferring abrasive and aggressive fluids or sheer-sensitive, viscous, particle-laden materials. T-Mag Mag-Drive pumps are available in 0.4 through 3.75 kw sizes, and come standard with a patented fluid flow path around the bushing to prevent heat buildup. The company also manufactures Advanced and Original Series metal and plastic pumps with a variety of elastomer options to meet abrasion, temperature, and chemical compatibility concerns.

Dewco offers pumps from a variety of manufacturers including LMI, Flojet, Stenner Pumps, and Tuthill Pumps. The LMI metering pumps are available in AA Series (0.58 to 0.75 gph), B Series (1.6 to 7.0 gph), and C Series (1.3 to 25.0 gph). Another option is the Flojet 5100: an air operated diaphragm pump designed for flows of 0 to 120 gph, which is self-priming and elastomer constructed to ensure chemical compatibility.

Fluid Metering Inc. (FMI) offers a variety of pumps including all-purpose, variable speed, hazardous duty, and sanitary pumps. The all-purpose pumps, constructed with the company's CeramPump valveless piston design, are available with flow maximums from 0.03 to 30 gph. FMI's two hazardous duty pumps, the QDX high flow and QSYX low flow, are appropriate for commercial, industrial, and laboratory hazardous applications. Meanwhile, their sanitary pumps are designed for food, dairy, biological, and pharmaceutical applications due to their resistance to chemical and biological attack and quick disassembly design, which is conducive to cleaning and sterilizing.

Max-Flo Pump Service is a pump distributor representing 12 different manufacturers, including Armstrong, Bell & Gossett, and Goulds. These companies offer a variety of pumps appropriate for use with chemicals in industrial applications, as well as those found in commercial, municipal, and institutional settings.

Progressive Pumps Corp. is a stocking distributor of chemical pumps and other fluid handling equipment. They offer metering, centrifugal, gear, and diaphragm pumps from over 20 manufacturers, including Tuthill, Liquiflo, Jabsco, and LMI.

Roth Pump Company offers pumps and pumping systems for the chemical processing, heating, and air conditioning industries. Chemical pumps include the low NPSH sealless magdrive pump that can produce any level of differential pressure to 1,500 ft and capacities from 4 to 180 gpm; the low NPSH chemical pump and regenerative turbine chemical duty pump for continuous, high pressure pumping of non-lubricating and corrosive liquids at only 1 ft NPSH; and the high pressure, low NPSH, multi-stage chemical pump, which handles continuous non-pulsating differential pressures up to 2,000 psi and up to 5,400 ft.

Timberline Plastics offers pumps from Orenco, Goulds, Little Giant, and A.Y. McDonald. Among the pump types provided are chemical, dewatering, effluent, sump, and more.

LMI specializes in the manufacture of electronic and motor-driven chemical metering pumps. The Roytronic Series A metering pump is available for applications up to 250 psi with capacities between 0.001 and 2.0 gph, while the Series B provides a max output of 7 gph and max pressure 150 psi, and the Series C, 25 gph and 300 psi. The motor-driven Series G has a max output of 312 gph at up to 175 psi.

Pulsafeeder offers a line of Chem-Tech Series pumps for use in chemical applications. The Chem-Tech XP Series uses peristaltic technology and is offered in three models, from the fixed-rate F Model to the variable speed V Model. The Series XPV peristaltic pump offers a more intuitive user interface through an LCD display; it features a flow totalization menu that reports the volume of chemical pumped. Finally, the Prime Performance pump and Series 100 and 150 pumps are meant for water treatment applications, while the Series 200 and 250 heavy duty diaphragm feed pumps are meant for use under strenuous conditions.

AB Industrial offers pumps in five classes: centrifugal, vertical, slurry, mag-drive/sanitary, and positive displacement. Each pump class is supplied from a long list of manufacturers like Goulds and Vanton, with a long list of available features and configurations.

CBF Sales distributes an assortment of pumps for chemical and other applications. They sell electronic metering pumps for water treatment (waste, cooling, boiler, etc.), paper chemical feed, and laboratory fluid metering, as well as self-priming centrifugal pumps by Barnes and Crown for municipal, industrial, marine, and corrosive fluid applications. Other stock options include duplex submersible pumps for effluent systems, submersible sewage pumps, grinder pumps, end-suction pumps, and more.

Coker Pump & Equipment offers several chemical pumps for use in bio-tech, pharmaceutical, and related industries. The list includes gear, rotary, air operated, and high pressure positive displacement pumps, end-suction and self-priming centrifugal pumps, and metering pumps. Manufacturers carried include Liquiflo, Viking, Neptune, Grundfos, and Hydra-Cell.

As a stocking distributor for March, Pulsatron, Viking, and several other manufacturers, Wood Equipment Co. offers centrifugal, positive displacement, metering, and proportioning pumps for chemical duty and similar applications.

D.L. Thurrott is a distributor for over 40 pump and pump accessory vendors.  They offer chemical feed pumps by Barnant Company, Grundfos, LMI, and Neptune, in addition to a variety of centrifugal, self-priming, and other pumps that can be used when handling chemicals.

Several types of chemical processing pumps are available from Pump Engineering Co., a distributor for Flowserve, Gormann-Rupp, Moyno, and several other manufacturers. Their pumps are capable of transferring everything from acids, polymers, and volatile organic compounds, to caustic and chlor-alkali, slurries, and solvents.