ARO Compact Non-Metallic Diaphragm Pumps
Spare Parts for ARO Compact Non-Metallic Air-Operated Diaphragm Pumps
Product Summary
Genuine OEM spare parts for ARO Compact Non-Metallic pumps: compact non-metallic air-operated double-diaphragm pumps. Service kits, diaphragms, balls and seats for each size are listed below with ARO part numbers from the operator’s manuals, so you can match the wetted materials on your pump.
Spare Parts List
✓ Tick the parts you need. Codes are as printed in the ARO operator’s manuals. Diaphragm, ball and seat materials are set by the model code, and fluid kit suffixes (-XX / -XXX) follow your model code, so pick your model in the form below. Not sure? Add a photo of the nameplate and we’ll match the parts for you.
| Select | Part (as printed by ARO) | Part number & reference |
|---|---|---|
| 3/8" Compact Non-Metallic (PD03P) | ||
| Air Section Service Kit | Part no. 637428 · Fits PD03P | |
| Fluid Section Service Kit (balls + diaphragms, no seats) | Part no. 637429-XX · Fits PD03P | |
| Diaphragm – Santoprene (also the backup diaphragm for PTFE) | Part no. 96533-A · Qty 2 · Fits PD03P | |
| Diaphragm – Hytrel | Part no. 96533-C · Qty 2 · Fits PD03P | |
| Diaphragm – PTFE | Part no. 96538 · Qty 2 · Fits PD03P | |
| Diaphragm – Viton | Part no. 96558 · Qty 2 · Fits PD03P | |
| Ball – Santoprene | Part no. 96481-A · Qty 4 · Fits PD03P | |
| Ball – Hytrel | Part no. 96481-C · Qty 4 · Fits PD03P | |
| Ball – Stainless Steel | Part no. 96513 · Qty 4 · Fits PD03P | |
| Ball – PTFE | Part no. 96481-4 · Qty 4 · Fits PD03P | |
| Ball – Viton | Part no. 96481-3 · Qty 4 · Fits PD03P | |
| Duckbill Check Valve – Nitrile | Part no. 96744-2 · Qty 4 · Fits PD03P | |
| Duckbill Check Valve – Neoprene | Part no. 96744-3 · Qty 4 · Fits PD03P | |
| Duckbill Check Valve – Viton | Part no. 96744-4 · Qty 4 · Fits PD03P | |
| Duckbill Check Valve – EPR/EPDM | Part no. 96744-1 · Qty 4 · Fits PD03P | |
| Seat – Acetal | Part no. 96580-2 · Qty 4 · Fits PD03P | |
| Seat – PVDF | Part no. 96580-3 · Qty 4 · Fits PD03P | |
| Seat – Polypropylene | Part no. 96580-1 · Qty 4 · Fits PD03P | |
| Seat – Stainless Steel | Part no. 96537 · Qty 4 · Fits PD03P | |
| Seat – Polypropylene (duckbill models) | Part no. 96745 · Qty 4 · Fits PD03P | |
| 1/2" Compact Non-Metallic (PD05P) | ||
| Air Section Service Kit | Part no. 637428 · Fits PD05P | |
| Fluid Section Service Kit (balls + diaphragms, no seats) | Part no. 637427-XX · Fits PD05P | |
| Diaphragm – Santoprene (also the backup diaphragm for PTFE / Long Life PTFE) | Part no. 93465 · Qty 2 · Fits PD05P | |
| Diaphragm – Hytrel | Part no. 93465-9 · Qty 2 · Fits PD05P | |
| Diaphragm – Nitrile | Part no. 93582-2 · Qty 2 · Fits PD05P | |
| Diaphragm – Long Life PTFE | Part no. 93111-L · Qty 2 · Fits PD05P | |
| Diaphragm – PTFE | Part no. 93111 · Qty 2 · Fits PD05P | |
| Diaphragm – Polyurethane | Part no. 93112 · Qty 2 · Fits PD05P | |
| Diaphragm – Viton | Part no. 93581-3 · Qty 2 · Fits PD05P | |
| Ball – Santoprene | Part no. 93100-E · Qty 4 · Fits PD05P | |
| Ball – Hytrel | Part no. 93100-C · Qty 4 · Fits PD05P | |
| Ball – Nitrile | Part no. 93100-2 · Qty 4 · Fits PD05P | |
| Ball – Stainless Steel | Part no. 93410-1 · Qty 4 · Fits PD05P | |
| Ball – PTFE | Part no. 93100-4 · Qty 4 · Fits PD05P | |
| Ball – Polyurethane | Part no. 93100-8 · Qty 4 · Fits PD05P | |
| Ball – Viton | Part no. 93100-3 · Qty 4 · Fits PD05P | |
| Seat – Acetal | Part no. 96572-2 · Qty 4 · Fits PD05P | |
| Seat – PVDF | Part no. 96572-3 · Qty 4 · Fits PD05P | |
| Seat – Polypropylene | Part no. 96572-1 · Qty 4 · Fits PD05P | |
| Seat – Stainless Steel | Part no. 95917-1 · Qty 4 · Fits PD05P | |
| 3/4" Compact Non-Metallic (PD07P) | ||
| Air Section Service Kit | Part no. 637428 · Fits PD07P | |
| Fluid Section Service Kit (balls + diaphragms, no seats) | Part no. 637427-XX · Fits PD07P | |
| Diaphragm – Santoprene (also the backup diaphragm for PTFE / Long Life PTFE) | Part no. 93465 · Qty 2 · Fits PD07P | |
| Diaphragm – Hytrel | Part no. 93465-9 · Qty 2 · Fits PD07P | |
| Diaphragm – Long Life PTFE | Part no. 93111-L · Qty 2 · Fits PD07P | |
| Diaphragm – PTFE | Part no. 93111 · Qty 2 · Fits PD07P | |
| Diaphragm – Viton | Part no. 93581-3 · Qty 2 · Fits PD07P | |
| Ball – Santoprene | Part no. 93100-E · Qty 4 · Fits PD07P | |
| Ball – Hytrel | Part no. 93100-C · Qty 4 · Fits PD07P | |
| Ball – PTFE | Part no. 93100-4 · Qty 4 · Fits PD07P | |
| Ball – Viton | Part no. 93100-3 · Qty 4 · Fits PD07P | |
| Seat – Polypropylene | Part no. 96572-1 · Qty 4 · Fits PD07P | |
| 1/2" Classic Compact Non-Metallic (66605X) | ||
| Air Section Service Kit | Part no. 637141 · Fits 66605X | |
| Fluid Section Service Kit (balls or duckbills + diaphragms, no seats) | Part no. 637140-XX · Fits 66605X | |
| Diaphragm – Neoprene | Part no. 93113 · Qty 2 · Fits 66605X | |
| Diaphragm – Nitrile | Part no. 93582-2 · Qty 2 · Fits 66605X | |
| Diaphragm – Viton | Part no. 93581-3 · Qty 2 · Fits 66605X | |
| Diaphragm – PTFE | Part no. 93111 · Qty 2 · Fits 66605X | |
| Diaphragm – EPR | Part no. 93760 · Qty 2 · Fits 66605X | |
| Diaphragm – Polyurethane | Part no. 93112 · Qty 2 · Fits 66605X | |
| Diaphragm – Hytrel | Part no. 93465-9 · Qty 2 · Fits 66605X | |
| Diaphragm – Santoprene (also the backup diaphragm for PTFE (-XX4 / -0X4)) | Part no. 93465 · Qty 2 · Fits 66605X | |
| Ball – Neoprene | Part no. 93100-1 · Qty 4 · Fits 66605X | |
| Ball – Nitrile | Part no. 93100-2 · Qty 4 · Fits 66605X | |
| Ball – Viton | Part no. 93100-3 · Qty 4 · Fits 66605X | |
| Ball – PTFE | Part no. 93100-4 · Qty 4 · Fits 66605X | |
| Ball – EPR | Part no. 93100-5 · Qty 4 · Fits 66605X | |
| Ball – Polyurethane | Part no. 93100-8 · Qty 4 · Fits 66605X | |
| Ball – Stainless Steel | Part no. 93410-1 · Qty 4 · Fits 66605X | |
| Ball – Santoprene | Part no. 93100-E · Qty 4 · Fits 66605X | |
| Duckbill Check Valve – Neoprene | Part no. 93114-1 · Qty 4 · Fits 66605X | |
| Duckbill Check Valve – Nitrile | Part no. 93114-2 · Qty 4 · Fits 66605X | |
| Seat – Stainless Steel | Part no. 93409-1 · Qty 4 · Fits 66605X | |
| Seat – Polypropylene | Part no. 93098-1 · Qty 4 · Fits 66605X | |
| Seat – Polypropylene (for PTFE and stainless steel ball models, -34X / -3AX) | Part no. 93098-10 · Qty 4 · Fits 66605X | |
| Seat – Pure PVDF | Part no. 93098-4 · Qty 4 · Fits 66605X | |
| Seat – Acetal | Part no. 93098-3 · Qty 4 · Fits 66605X | |
| Seat – Polypropylene (duckbill insert) | Part no. 93115-1 · Qty 4 · Fits 66605X | |
How we confirm the exact part: Part numbers on this page are as printed in the current ARO operator’s manual for each size. The materials, thread type (NPT or BSP) and options are coded in the full model number on the nameplate (for example PD20A-BAP-STT-B), and older revisions can use different parts, so send the full model number or a nameplate photo and we’ll confirm the right part before we quote.
Service Intervals & When to Replace
- Diaphragms, balls and seats are the main wear parts. ARO lists them as “Smart Parts” to keep on hand with the service kits for a fast repair.
- Fluid section service kit: renews the diaphragms, balls (and seats where the kit includes them) plus the fluid-side O-rings and seals. Fit it whenever a diaphragm fails or flow drops off.
- Air section service kit: renews the air motor seals and wear parts. Fit it if the pump blows air, stalls or short-strokes.
- Air supply: filter the air to 50 microns and never exceed the maximum air inlet pressure on the nameplate. Most applications need no air-line lubrication.
- Shutdown: flush the pump with a suitable solvent if the product can set up while idle, and keep a service log as part of a preventive maintenance program.
Models
This page covers ARO Compact Non-Metallic pumps in 3/8", 1/2", 3/4", 1/2". The full model code (for example PD10A-BAS-STT) is on the pump nameplate and sets the materials and kit suffixes.
Models & Key Specifications
| Model | Size | Max flow | Max air pressure | Max particle size | Manual |
|---|---|---|---|---|---|
| PD03P | 3/8" | 10.6 gpm (40.1 lpm) | 100 psig (6.9 bar) | 1/16” dia. (1.6 mm) | PX03P-XXX-XXX-AXXX |
| PD05P | 1/2" | 14.4 gpm (54.5 lpm) | 100 psig (6.9 bar) | 3/32” dia. (2.4 mm) | PX05P-XXX-XXX-BXXX |
| PD07P | 3/4" | 14.8 gpm (56.0 lpm) | 100 psig (6.9 bar) | 3/32” dia. (2.4 mm) | PX07P-XXX-XXX-AXXX |
| 66605X (Classic) | 1/2" Classic | 13 gpm (49.2 lpm) | 100 psig (6.9 bar) | 3/32” dia. (2.4 mm) | 66605X-X |
Figures from the ARO operator’s manuals (flooded inlet where stated). Typical uses: chemical dosing and sampling, small transfer, laboratory and OEM equipment.
Troubleshooting
Product discharged from the air exhaust
Likely cause: A ruptured diaphragm, or a loose diaphragm washer, nut or screw. Action: Replace the diaphragms (the fluid section service kit includes them) and tighten the diaphragm hardware to the manual torque.
Air bubbles in the product discharge
Likely cause: A leak in the suction plumbing, worn O-rings between the inlet manifold and fluid caps, or loose diaphragm hardware. Action: Check the suction connections, replace the manifold O-rings and tighten the diaphragm washer, nut or screw.
Low output volume, erratic flow or no flow
Likely cause: Low air supply, a blocked or kinked outlet hose, a collapsed or undersized suction hose (cavitation), leaking inlet joints, or a solid object lodged in the diaphragm chamber or seat area. Action: Check the air supply and hoses, use a non-collapsing suction hose at least the size of the pump inlet, make the inlet joints airtight, and inspect the balls and seats for damage or debris.
Air motor blows air or stalls
Likely cause: Worn major valve seals, pilot valve parts or check valve, or a restriction in the valve or exhaust. Action: Fit the air section service kit (renews the air motor seals and wear parts) and clear the exhaust and muffler.
Request for Quotation
Selected Parts:
- No parts selected
Not sure which parts? Just send a photo of the nameplate or part below.
ARO Compact Non-Metallic spare parts: frequently asked questions
Tap a question to see the answer.
What spare parts are listed for ARO Compact Non-Metallic pumps?
Each size from 3/8" to 1/2" has its own list of air and fluid section service kits, diaphragms, balls and seats, with ARO part numbers from the operator’s manuals. Diaphragms are listed in EPR, Hytrel, Long Life PTFE, Neoprene, Nitrile, PTFE, Polyurethane, Santoprene and Viton. See all ARO spare parts by series.
Which fluid section service kit fits my Compact Non-Metallic pump?
The kit number changes with size, and its suffix follows the ball and diaphragm materials in your model code. On the 3/8" pump, for example, it is 637429-XX. Tick the kit and add your full model number or a nameplate photo, and we’ll confirm the exact suffix before quoting.
Why is product coming out of the air exhaust?
The troubleshooting guide points to a ruptured diaphragm or a loose diaphragm washer, nut or screw. Replace the diaphragms, which are included in the fluid section service kit, and tighten the diaphragm hardware. Diaphragms for each wetted material are listed in the table above.
What should I do if the air motor blows air or stalls?
Worn major valve seals, pilot parts or a restricted exhaust are the usual causes. The air section service kit renews the air motor seals and wear parts; on the 3/8" pump it is part 637428. Clear the exhaust and muffler as well.