The fastest way to find, compare and buy air operated double diaphragm pumps.
Describe the flow rate, fluid type, or material compatibility you need. ChatMRO finds the exact match, shows alternatives, and gives you a quote — in seconds. No part number needed.
Updated
AI-generated imageAn air operated double diaphragm pump (AODD) uses compressed air to drive two flexible diaphragms back and forth in alternating chambers — as one diaphragm is pushed by air pressure to expel fluid through a check valve, the other diaphragm is pulled back to draw fluid in, and an air valve automatically shifts air flow between the two chambers once each stroke completes. This self-priming, positive-displacement design has no motor, no mechanical seals, and no rotating shaft in the fluid path, letting it run dry indefinitely without damage and handle everything from thin solvents to viscous slurries and abrasive solids.
Chemical processing plants, paint and coatings manufacturers, wastewater treatment facilities, and general industrial operations rely on AODD pumps wherever fluid needs to move reliably across a wide range of viscosities, chemical compatibilities, and solids content — drum and tote transfer, chemical metering, filter press feed, and sump/dewatering applications are common uses. Because pump speed is set simply by air supply pressure and volume rather than a fixed motor speed, AODD pumps offer inherently variable flow control, can be throttled to a stall without damage, and — since Jim 'Slim' Wilden invented the format in 1955 — have become the standard choice across industries needing this combination of ruggedness, chemical versatility, and simple air-only operation.
Common configuration: sizes from 1/4" up to 8" discharge, flow rates from a few GPM on the smallest models up to 200+ GPM on large 2"+ models, maximum operating pressure typically 100-125 psi (some metal models rated up to 3,200 psig), and liquid path materials spanning aluminum, cast iron, stainless steel, Hastelloy C, polypropylene, PVDF (Kynar), and acetal. Diaphragm elastomer options — Buna-N, EPDM, FKM (Viton), Neoprene, PTFE, Wil-Flex, and Geolast — are selected based on chemical compatibility and temperature range, spanning roughly -60°F to 350°F depending on material.
Stop second-guessing. Match your use case below — then let ChatMRO's AI surface the exact size, material, and alternatives in one natural-language search.
Transferring chemicals or fluids from drums and totes at moderate flow. 1/4"-1" size pumps dominate here.
Mid-size process transfer including paints, coatings, and general industrial fluids. 1.5"-2" size pumps dominate here.
Large-volume transfer of slurries, concrete, or fluids with significant solids content.
Air operated double diaphragm pumps are supplied by the two dominant names in the category — Wilden (inventor of the AODD format) and Graco (Husky series) — spanning the full size and material range. Here's how to navigate the class without a 40-tab browser session.
ChatMRO indexes AODD pump inventory across manufacturers. Search any product by description, application, or rough spec.
The general-purpose workhorse. Flow rate to 45 GPM (metal) or 37 GPM (plastic), 125 psi max operating pressure, operable on as little as 20 psi supply air. Stall-free low pulsation air valve, no mechanical seals, center/end porting options.
Search Wilden P2/Husky 515 Style →Flow rate up to 165-206 GPM depending on model and material. Single-piece polypropylene center section or clamped metal design, patented modular air valve, ANSI center and end-porting options. Up to 200 GPM on the highest-flow 2" models.
Search Wilden P4/P8, Husky 1050/2200 Style →Sizes from 1/4" to 8", available in aluminum, cast iron, stainless steel, Hastelloy C, polypropylene, PVDF (Kynar), and acetal. Rated up to 3,200 psig and 350°F on select metal models with PTFE elastomers for extreme service.
Search Wilden Metal/Alloy Series →Use this table as a decision shortcut. Ask ChatMRO for the exact part once you know which row fits your spec.
| Size | Max Flow Rate | Max Pressure | Best For | Common Materials | Elastomer Temp Range | ChatMRO Verdict |
|---|---|---|---|---|---|---|
| 1/4"-1/2" | Up to ~20 GPM | 100-125 psi | Small-batch chemical dosing, lab-scale transfer | PVDF, polypropylene | -40°F to 280°F (elastomer dependent) | Best for the smallest, most precise transfer needs |
| 1" | Up to 45 GPM (metal), 37 GPM (plastic) | 125 psi | Drum/tote transfer, general chemical handling | Aluminum, stainless, polypropylene, PVDF | -40°F to 350°F (elastomer dependent) | Most common choice for standard drum-scale transfer |
| 1.5" | Up to 206 GPM (plastic), 87 GPM (metal PX4) | 125 psi | Higher-volume process transfer | Metal or plastic | -40°F to 350°F (elastomer dependent) | Go-to when 1" flow isn't sufficient for process demand |
| 2" | Up to 200-757 lpm (high-flow models) | 100-125 psi | High-volume industrial and paint/coatings transfer | Metal or polypropylene | -40°F to 350°F (elastomer dependent) | Use for the highest standard-range flow requirements |
| 3"-8" | Up to 300+ GPM | 125 psi (up to 3,200 psig on specialty metal models) | Slurry, concrete, and heavy solids-laden fluid transfer | Cast iron, stainless, Hastelloy C | Up to 350°F | Best for the largest volume and heaviest solids-handling needs |
| Generic Import AODD Pump | Variable | Manufacturer-stated only | Budget, occasional light use | Variable | Manufacturer-stated only | Verify elastomer temperature rating and wetted material compatibility before continuous use |
Not sure which row is yours? Describe your application to ChatMRO and get an instant AI-matched recommendation with datasheets.
Traditional catalogues force you to know the exact MPN before you find anything. ChatMRO flips that: describe what you need in plain English, and the AI finds the right pump from 30M+ indexed parts.
In plain language — by flow rate, fluid type, or material compatibility. No MPN required.
Natural language processing maps your description to the closest-fit products across brands and specs.
Cross-brand equivalents, lower-cost substitutes, and in-stock alternatives shown side-by-side.
Add to cart or request RFQ directly from the results. No phone calls. No email chains.
Whether you're a process engineer specifying pumps for a new chemical transfer skid, or a facilities technician replacing a worn-out unit — use this framework before you procure.
AODD pump speed and output flow are directly tied to air supply pressure and volume — confirm the compressor feeding it can supply the CFM needed to hit your target GPM, not just that a pump of the right size exists.
Polypropylene and PVDF suit a broad range of chemicals; stainless steel and Hastelloy C suit more aggressive or corrosive fluids; aluminum and cast iron suit general non-corrosive industrial fluids — confirm compatibility with your specific chemical.
PTFE offers the broadest chemical resistance across a wide temperature range; Buna-N, EPDM, FKM, Neoprene, and Wil-Flex each have different chemical and temperature suitability — verify against your fluid's safety data sheet.
If your fluid contains particulates or slurry solids, confirm the pump's maximum solids diameter rating accommodates your material without risking clogging or diaphragm damage.
AODD pumps are self-priming with a rated maximum dry and wet suction lift — confirm this covers the vertical distance and priming conditions of your specific installation, especially for sump or below-grade tank applications.
A properly sized pump won't hit its rated flow if your compressed air system can't supply sufficient CFM at the required pressure. Search by function on ChatMRO — the AI surfaces exact matches AND available substitutes matched to realistic air supply conditions.
Running a diaphragm elastomer above or below its rated temperature range significantly shortens diaphragm life — confirm the elastomer's specific range (e.g., Buna-N at 10-180°F vs. PTFE at 40-300°F) against your actual process temperature.
Plastic (polypropylene) pumps handle many chemicals well but may wear faster under heavy abrasive solids compared to metal construction — confirm material durability against your specific solids content.
Describing your application to ChatMRO takes 30 seconds. The AI reads AODD pump spec sheets across brands so you don't have to.
Just describe what you need. ChatMRO finds the right air operated double diaphragm pump in seconds.
Air operated double diaphragm pumps are among the most versatile fluid transfer solutions across chemical processing, paint and coatings, wastewater treatment, and general industrial applications. Wilden, which invented the AODD format in 1955, and Graco (Husky series) command significant market presence due to their proven stall-free air valve designs, broad size range from 1/4" to 8", and extensive wetted material and elastomer options spanning chemical compatibility from mild aqueous fluids to aggressive corrosive chemicals and abrasive slurries. Procurement professionals and process engineers in India, Southeast Asia, and North America regularly source AODD pumps for drum/tote transfer, chemical metering, filter press feed, and sump dewatering applications.
ChatMRO simplifies this procurement process by providing AI-powered natural language search across a catalogue of 30 million+ indexed industrial parts. Engineers and buyers no longer need to memorize model codes or navigate multi-level filter trees to find the right pump. A simple description of the flow rate, fluid type, or material compatibility is sufficient to surface the correct product alongside cross-brand alternatives and real-time pricing.
