Active Aqua Replacement Diaphragm | 2-Pack

These replacement diaphragms are designed specifically for the Active Aqua Dual Diaphragm Air Pump (AADAP25L), rated at 25 L/min. They are not guaranteed to fit other Active Aqua air pump models — always verify your pump's model number before ordering to ensure compatibility.

The most common signs of a worn diaphragm are reduced airflow output, weaker bubbling from cylindrical air stones, and a change in the pump's operating sound — often a louder or more labored tone than normal. If your pump is running but not delivering adequate aeration to your system, the diaphragm is the first component to inspect and replace.

Installation requires only a standard screwdriver and a small crescent wrench — no specialized tools needed. Step-by-step instructions are included in the pack, making this a straightforward DIY repair even for first-time pump maintenance.

In most cases, yes — diaphragm wear is the primary cause of reduced airflow in this pump type, and a fresh diaphragm restores output to the pump's original 25 L/min factory specification. If airflow remains low after replacement, other components such as the outlet valves or Active Aqua black vinyl tubing connections may also need inspection.

For pumps running continuously in a hydroponic environment, inspecting the diaphragm every 12 months is a reasonable preventive maintenance interval. Replacing it proactively avoids unexpected downtime during active grow cycles. For setups using an Active Aqua 12-outlet metal air manifold, ensuring consistent pump pressure is critical for even distribution.