Auto Top Off Reservoir with Visible Water Level and Dual Access Lids for Flexible Aquarium Cabinet Placement

Keep top-off water close to your aquarium in a slim reservoir that can sit inside the sump cabinet or alongside it when cabinet space is limited.

The transparent body and marked scale make the remaining water easy to check, while separate front and rear openings keep refilling apart from the pump connections.

Key Features

• Transparent walls let you check the water level at a glance, making routine aquarium care easier to plan.
• The marked scale shows how much water remains, so refill timing is clearer without opening the reservoir.
• A strong carry handle provides a dedicated grip when moving the container for refilling or placement.
• The rear lid accommodates the ATO pump, pipe, and cable; the front lid gives convenient access for adding top-off water.
• Placement inside or beside the sump cabinet gives aquarists flexibility when organizing equipment around the tank.

Specifications

• Available variants: 18L - 5 Gallon and 40L - 10 Gallon.
• The 18 L model has a stated volume of 4.8 gallons and measures 22 × 3.5 × 17 inches.
• The 40 L model has a stated volume of 10.6 gallons and measures 22 × 7 × 20 inches.
• The 18 L reservoir can top off an average 200-litre tank for one week.
• The 40 L reservoir can top off a 500-litre tank for one week.
• For REEFER G2/G2+ models, the 18 L size is compatible with every listed model from 170 through S-100; the 40 L size is not compatible with 170, 200, 250, or 350.
• For REEFER MAX G2+ models, neither size fits 170 or 200; the 40 L size also does not fit 250 or 350.
• On REEFER MAX 300 G2+, both sizes are compatible, but ReefDose cannot be mounted on the Slide Out Control Panel when using the 40 L size.
• For Peninsula MAX G2+, the 18 L size fits all listed models; the 40 L size does not fit the 350 model.
• Neither size is compatible with DESKTOP Cube or MAX NANO Cube.
• Both sizes are compatible with DESKTOP Peninsula, MAX NANO Peninsula, MAX NANO XL, MAX E-170, MAX E-260, MAX S-400, MAX S-500, and MAX S-650.

Choose the size that matches your aquarium and cabinet layout for a tidier, easier-to-monitor top-off routine.