Active Aqua Replacement Diaphragm for AADAP25L Air Pump, Pack of 2

Restore Full Airflow to a Worn Dual Diaphragm Pump

Every diaphragm air pump loses output gradually as its internal diaphragms wear, and replacing worn diaphragms is far cheaper than replacing the whole pump. This pack of two replacement diaphragms is sized specifically for the Active Aqua AADAP25L Dual Diaphragm Air Pump, letting growers restore full airflow with a straightforward parts swap instead of a new pump purchase.

The install is a simple screwdriver-and-wrench job with instructions included, so no specialized tools or pump-repair experience are needed to bring a tired AADAP25L back to its rated output.

Key Features & Benefits

• Pack of two diaphragms — matches the AADAP25L's dual diaphragm design, one pack covers both.
• Direct-fit replacement — sized specifically for the AADAP25L, not a universal part.
• Screwdriver-and-wrench install — no specialized tools needed to complete the swap.
• Instructions included — walks through the replacement step by step.

Who Should Use This Replacement Part

Growers whose AADAP25L pump has noticeably weaker airflow than when it was new — a sign of worn diaphragms rather than pump failure — are the fit for this part.

About Active Aqua

Active Aqua stocks matched spare parts, like this diaphragm pack, for its own aeration pumps — one corner of the broader equipment lineup Hydrofarm distributes under the brand.

Frequently Asked Questions

How do I know my diaphragms need replacing?

Noticeably weaker airflow compared to when the pump was new is the main sign, especially if it's gradual rather than sudden. A sudden total stop is more likely an electrical issue than a worn diaphragm.

How many diaphragms come in this pack?

It includes two diaphragms, matching the AADAP25L's dual diaphragm design. One pack is enough to replace both diaphragms in a single pump.

What tools do I need for the swap?

A basic screwdriver and wrench are all that's needed, and instructions are included in the pack. No specialized pump-repair tools or experience are required.

Will this fit other Active Aqua air pumps?

No, this diaphragm pack is sized specifically for the AADAP25L Dual Diaphragm Air Pump. It isn't a universal fit for Active Aqua's other single-diaphragm air pump models.

How often should diaphragms be replaced?

There's no fixed schedule — replace them when airflow output has noticeably dropped rather than on a calendar interval, since wear rate depends on runtime and usage conditions. Keeping a spare pack on hand avoids downtime once that point is reached.