Active Aqua Black Port Hole Cover | Fits All Reservoir Covers

What a Port Hole Cover Does for a Sealed Reservoir

A covered reservoir is only covered if the access opening is closed too. This one measures 7.8 x 6.3 x 1.8 in and weighs about 0.24 lbs. It sits inside the lid rather than on top, so anything landing on it drains back into the tank. The shape is slightly convex and ribbed, which is what gives a piece of thin plastic that much rigidity. Multiple drill access points are moulded in for meter cables and pump cords, so the lid stays sealed around whatever passes through it. It is black, which is the point: light is what turns a nutrient tank green. Active Aqua lists it as fitting all sizes of their reservoir covers.

Why Growers Fit a Porthole Cover and Then Forget It

A porthole cover is among the least costly parts in a room, and one of the few that quietly earns its place every day. Evaporation slows, algae has nothing to work with, and airborne dust and fungus gnats stop finding an open tank. The trade-off is access, which is why this lifts out rather than screwing down. Testing pH or adding nutrient means removing one panel, not the whole lid. Drill the cable ports before the tank is full rather than after. Keep it black if solution clarity matters, since the white version passes more light than people expect on a bright bench. Check it seats flat after any change to what runs through it.

Key Features

• Closes the lid access opening: Light, dust and insects stay out of the solution while access stays easy.
• Sits inside the reservoir top: Any water landing on it drains back into the tank, not down the outside.
• Convex and ribbed: Gives a thin panel real rigidity and sheds standing water.
• Multi drill access points: Moulded positions for meter probes and pump cords through a sealed lid.
• Fits all sizes: Matches every Active Aqua reservoir cover in the range.

Technical Specifications