AutoPot 12.4 Gallon Hard Tank Reservoir – 12.4 Gallon Hard Tank Lid

The AutoPot 12.4 Gallon Hard Tank Reservoir is a pre-drilled solid plastic reservoir designed to supply nutrient solution to AutoPot passive watering systems through gravity alone — no pumps, no timers, no electricity required. This kit includes the 12.4-gallon tank, a matching lid, a Top Hat Grommet, a Golf Filter Kit, and 1 foot of 3/8-inch OD tubing, giving you everything needed to connect to an inline tap and start feeding your grow.

AutoPot 12.4 Gallon Hard Tank Reservoir Specifications

All specifications are drawn directly from the manufacturer product data provided with this kit.

Specification	Value
Capacity	12.4 gallons
Height	24 inches
Width at Lid	14.5 inches
Width at Base	11 inches
Tubing Included	1 foot of 3/8-inch OD tubing
Weight	1.0 lb
Kit Contents	Pre-drilled tank, matching lid, Top Hat Grommet, Golf Filter Kit, 1 ft tubing
Minimum Elevation Required	6 inches above the highest AQUAvalve
Inline Tap	Not included — required separately
Brand	Autopot Watering Systems USA

Why Choose the AutoPot 12.4 Gallon Hard Tank Reservoir

AutoPot’s passive watering approach relies entirely on gravity pressure rather than pumps or electricity. The reservoir is the central supply point for that system, and this 12.4-gallon hard tank is designed to serve that role reliably for small to mid-size AutoPot configurations. Here is what makes it a practical choice:

• Complete connection kit in one package. The tank ships with its lid, a pre-installed Top Hat Grommet, a Golf Filter Kit, and a length of 3/8-inch OD tubing. You have the components needed to connect to an inline tap (sold separately) without sourcing fittings elsewhere.
• Pre-drilled for direct assembly. The reservoir arrives with the outlet hole already drilled and fitted with the grommet. This avoids measuring and cutting errors during setup and ensures a leak-free seal at the connection point.
• Sufficient capacity for setups up to six pots. At 12.4 gallons, the tank holds enough volume to supply multiple AQUAvalve-fed pots without constant refilling. The capacity rating covers 1Pot configurations up to 6Pot, easy2grow up to 4 units, and several other AutoPot system variants.
• Solid construction for long-term use. The hard tank design maintains its shape under pressure and when handled, unlike flexible bladder reservoirs. The tapered profile (wider at the lid than at the base) makes the tank stable when positioned on a stand or raised surface.
• Matched lid included. The lid keeps the nutrient solution covered to reduce evaporation, limit contamination from debris, and block light that would otherwise encourage algae growth in the reservoir.

The tank is built specifically around the AutoPot AQUAvalve mechanism. Gravity pressure from the elevated reservoir opens and closes each valve passively, so solution delivery is automatic once the system is filled and the inline tap is open. The 12.4-gallon capacity fits growers who need a compact, manageable reservoir rather than a larger tank that is difficult to lift and refill.

Best Uses for the AutoPot 12.4 Gallon Hard Tank Reservoir

This reservoir is designed for one specific application: gravity-fed nutrient delivery in AutoPot passive watering systems. Within that application, several grow configurations and operator types benefit most from this tank size.

• Small hobby and home grows (1–6 pots). A 12.4-gallon reservoir is well-suited to grows with one to six AutoPot 1Pot or 1Pot XL units. The volume is easy to mix and carry during refills, making it practical for growers managing their reservoir manually without a mixing station.
• Compact indoor grow rooms with limited floor space. The tank’s vertical profile — 24 inches tall and only 11 inches across at the base — occupies a narrow footprint. It can be raised on a stand and positioned against a wall or in a corner without consuming valuable grow floor area.
• easy2grow, GeoPot XL, and XXL configurations up to 4 units. Growers running these AutoPot variants with up to four modules will find the 12.4-gallon capacity provides adequate between-fill intervals, reducing the frequency of tank maintenance.
• easy2GO, AQUAplate, and easy2Propagate systems. Propagation trays and self-watering plate systems draw relatively low volumes per cycle. This tank is a well-matched supply source for these setups, where consistent low-volume delivery matters more than raw capacity.
• Growers transitioning from manual watering to passive automation. AutoPot systems are often the first passive-feed setup a hobby grower adopts. The 12.4-gallon hard tank is an affordable starting point that can be extended by moving to a larger reservoir later, while retaining the same fitting hardware.
• Replacement or expansion reservoirs. If you already run an AutoPot system and need a second or replacement reservoir for a separate grow space or a backup tank during cleaning cycles, this kit provides a complete ready-to-connect unit.

Compatibility

The AutoPot 12.4 Gallon Hard Tank Reservoir is designed to work exclusively with AutoPot passive watering systems. The AQUAvalve mechanism used in these systems requires a gravity-fed supply source elevated at least 6 inches above the highest valve in the run. This tank’s 24-inch height, combined with a stand or raised platform, provides sufficient head pressure for standard indoor setups. The following AutoPot systems are confirmed compatible at the capacity ranges listed:

• 1Pot System: compatible from 1Pot up to 6Pot configurations
• easy2grow System: compatible from single unit up to easy2grow 4
• 1Pot XL System: compatible from 1Pot XL up to 4Pot XL configurations
• GeoPot XL System: compatible from single unit up to GeoPot 4
• XXL System: compatible from single unit up to XXL 4
• easy2GO: fully compatible
• AQUAplate: fully compatible
• easy2Propagate: fully compatible

Systems requiring more than 6 pots (for 1Pot) or more than 4 units (for XL-class and easy2grow variants) will require a larger-capacity reservoir. If you are running a reverse osmosis system as your water source, ensure the RO output flow rate can keep pace with refill demand. For systems requiring in-line water treatment or EC monitoring, pair the reservoir with a calibrated EC meter such as one from the water management accessories category to verify solution strength before opening the inline tap.

The outlet fitting uses a 3/8-inch OD tube connection. The included Golf Filter Kit sits inline at the tank outlet to catch particulate before it reaches the AQUAvalves. If your water source has high particulate load, inspect and clean this filter regularly to maintain consistent flow.

Usage Guidelines

AutoPot systems are passive — once the reservoir is filled, mixed, and the inline tap is open, the AQUAvalves handle delivery automatically. However, there are a few operating practices that keep the system running correctly over time.

Mixing nutrient solution. Mix your nutrient solution in a separate container or directly in the tank before opening the inline tap. Adjust pH and verify EC before connecting the tank to the system. The reservoir lid helps maintain solution quality between refills, but check nutrient levels and pH at each refill cycle, particularly in warm conditions where evaporation is higher.

Tank elevation. The reservoir must be raised a minimum of 6 inches above the highest AQUAvalve in your system. Greater elevation increases the gravity head pressure and can speed valve response, but the system is calibrated for low-pressure operation — do not exceed practical elevations that make refilling unsafe or unstable. The separately available Foldable Tank Stand (not included in this kit) is built to support this tank at the correct working height, with a rated capacity of 300 lb and a rubber grip surface to prevent movement. Its folded dimensions are 1.25 x 12.88 x 16.87 inches; assembled it measures 12.69 x 9.5 x 8.69 inches with a platform of 11.88 x 8.75 inches.

Algae prevention. Always keep the lid on when the tank is in use. Algae growth in the reservoir is one of the most common maintenance issues in passive systems. Even a brief period of light exposure to a nutrient-rich solution can initiate algae growth. Opaque tank walls and a fitted lid are the primary defenses.

Cleaning between cycles. Between growing cycles, drain the tank fully, rinse it with clean water, and allow it to dry before refilling. Remove the Golf Filter Kit and rinse the mesh screen. Inspect the grommet seal and the tubing for cracks or hardening that could indicate degradation.

How to Set Up the AutoPot 12.4 Gallon Hard Tank Reservoir

The following steps describe how to connect this reservoir kit to an AutoPot system. You will need an inline tap (sold separately) and a completed AutoPot pot array with AQUAvalves installed before starting.

1. Inspect the kit contents. Confirm you have the pre-drilled 12.4-gallon tank, the matching lid, the Top Hat Grommet, the Golf Filter Kit, and 1 foot of 3/8-inch OD tubing. Check the grommet is correctly seated in the pre-drilled outlet hole and shows no gaps around the edge.
2. Position the reservoir above your pot array. Place the tank on a stand or raised surface so the outlet is at least 6 inches higher than the highest AQUAvalve in your system. If using the optional Foldable Tank Stand, unfold and lock it into position before setting the tank on the rubber grip platform.
3. Install the Golf Filter Kit. Thread the Golf Filter Kit onto the outlet grommet at the base of the tank. This filter catches any particulate in the nutrient solution before it reaches the inline tap and the AQUAvalves downstream. Hand-tighten only — do not over-torque the fitting.
4. Attach the inline tap. Connect your inline tap (purchased separately) to the outlet fitting downstream of the Golf Filter Kit. Ensure the tap is in the closed position before connecting.
5. Connect the distribution tubing. Use the included 1 foot of 3/8-inch OD tubing to run from the tap to the main distribution line of your AutoPot system. Secure all connections and check for leaks before filling the tank.
6. Mix and fill the tank. Prepare your nutrient solution to the correct pH (typically 5.8–6.5 for most crops in hydroponic media) and target EC for your growth stage. Pour the mixed solution into the tank and place the lid on securely.
7. Open the inline tap slowly. Open the inline tap gradually to allow solution to flow into the system distribution line and reach the AQUAvalves. Monitor the first few AQUAvalve-fed trays for 10–15 minutes to confirm valves are opening and closing correctly. Adjust tank elevation if valves are not cycling as expected.
8. Monitor the fill level. Check the tank at regular intervals during the first grow cycle to understand your system’s consumption rate. Refill before the tank runs completely dry to avoid air entering the distribution lines.

If you are also monitoring water quality, a calibrated instrument like the Apera GroStar EC electrode can help you verify solution strength at the reservoir before and after mixing to maintain consistent nutrient delivery across refill cycles.

Sources & Further Reading