Part Code: ASAB-SDDP42-14
Introducing the ASAB DDP42 Diaphragm Set — a complete diaphragm replacement set engineered to restore smooth, reliable performance in ASAB DDP42 Double Diaphragm Pumps. Diaphragms are a primary wear component in any AODD pump, and when they start to fatigue you’ll often see loss of output, inconsistent cycling, poor prime hold, or product/air-side sealing issues depending on the failure mode.
This diaphragm set is the right choice for scheduled servicing or when you’re rebuilding a wet end to get the pump back to stable, efficient operation. Replacing diaphragms as a set helps ensure balanced flex, correct clamp load across the stack, and consistent stroke performance—especially important on higher-output pumps like the DDP42.
Whether you’re doing preventative maintenance, fixing a pump that’s lost its punch, or rebuilding after a diaphragm failure, the ASAB-SDDP42-14 is a workshop-ready solution to get your DDP42 back in the game.
Key Benefits
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Complete diaphragm set for ASAB DDP42 double diaphragm pumps
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Restores consistent output, stable cycling, and prime reliability
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Ideal for wet-end rebuilds and scheduled preventative maintenance
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Helps address symptoms like reduced flow, surging, erratic cycling, or prime loss
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Replacing as a set supports balanced flex and longer service life
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Reduces risk of repeat downtime from mixed old/new diaphragm performance
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Built for commercial workshop and job-site use
What’s Included
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DDP42 Diaphragm Set — ASAB-SDDP42-14
Safety Check
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Isolate and depressurise first: Shut off air supply, bleed the airline fully, and confirm the pump is not pressurised before disassembly.
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Chemical exposure: Wear gloves and eye protection — product can remain trapped in the chambers.
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Keep parts in order: Note diaphragm stack orientation during strip-down to avoid incorrect reassembly.
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Inspect mating parts: Check plates, pads, seals/O-rings, and valve components—don’t bolt new diaphragms onto damaged sealing faces.
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Even tightening: Reassemble using a cross-pattern and correct torque to prevent pinching or uneven diaphragm clamp.
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Test gradually: Bring air pressure up slowly, confirm smooth cycling and no leaks, then return to operating conditions.