Active Aqua Black Porthole Cover

The Active Aqua Porthole Cover is compatible with all Active Aqua reservoir cover sizes — including the Active Aqua Black Reservoir Cover - 50 Gallon and the Premium White Reservoir Cover line. A single porthole cover works across the entire lineup, so there's no need to match it to a specific size when ordering.

An uncovered porthole opening is still a point of light entry, evaporation, and contamination — even on an otherwise fully covered reservoir. Without the porthole cover in place, light passes through the opening and can seed algae growth directly below the port, and airborne particles settle into the nutrient solution through the gap. The porthole cover completes the seal the reservoir lid starts.

Yes — the porthole cover seats into the opening on the reservoir lid and stays in place under normal operating conditions, including incidental contact and pump vibration. It's designed to be removed and replaced easily by hand without tools, so access remains quick while the cover holds its position reliably between maintenance intervals.

The porthole cover is a solid cap designed to seal the opening when not in active use. For running permanent lines like pump cords, Active Aqua Black Vinyl Tubing, or probe cables, the main reservoir lid's drill access points are the recommended route — reserve the porthole for periodic manual access rather than continuous pass-throughs.

Yes — even a small opening in a reservoir lid allows meaningful evaporative loss over time, particularly in warm grow rooms where air circulation is active. Evaporation concentrates the nutrient solution, gradually raising EC and shifting pH. In large setups like the 100 Gallon Active Aqua 2.0 Black Reservoir, even modest evaporation rates add up quickly across a grow cycle.