21 cm brown distribution ring seen from above, with its T-fitting

Brown distribution ring placed at an angle, tee and connection outlet in the foreground

Close-up of the tee on the distribution ring, the column fitting and the small nipple on top

Distribution ring set on clay pebbles at the base of a young plant, clear pipe connected

Green hydroponic pot filled with clay pebbles, the distribution ring placed around the centre

Distribution ring for 15 or 45 L hydroponic pot

Name: Distribution ring for 15 or 45 L hydroponic pot
Brand: Terra Aquatica
SKU: TA-CM-ANNEAU
Availability: InStock

$10.00

$3.33 × 3 with no fees Klarna.

This 21 cm distribution ring spreads the nutrient solution in a fine shower over the clay pebbles in the 15 or 45 L hydroponic pot. It is the original part, sold singly or in packs of 4 to fit out several pots.

Ref. TA-CM-ANNEAU·Spare part

Quantity : Individual

Individual

Pack of 4

Customer support 7 days a week by email

Delivery within 2 to 15 business days

100 % secure payment

The summary

What you receive: 1 or 4 rings of 21 cm, with their connecting tee.
Which pot it suits: the 15 or 45 L reservoir hydroponic pot, mains or solar.
When to replace it: cracked, warped, broken tee or holes blocked despite cleaning.
What ships to you: a small, light parcel.

Replacement part that waters the clay pebbles of the 15 or 45 L hydroponic pot

This distribution ring is the part that waters the grow medium of the 15 or 45 L reservoir hydroponic pot. Placed on the clay pebbles around the plant, it receives the nutrient solution brought from the reservoir and spreads it as a fine spray through a series of small holes. You replace it when it is cracked, warped or lost, without changing the rest of the circuit, and the pack of 4 fits out the pots of a complete installation in one go, such as the kit of 4 pots connected to a shared reservoir.

The diameter

The ring measures 21 cm in diameter, which lets it surround the base of the plant at a good distance from the stem.

The fitting

A tee fitted with a 10 mm male outlet connects it to the pumping column immersed in the tank.

The material

It is moulded from brown low-density polyethylene, which stays flexible and withstands the constant humidity of the pot.

Compatible pots

The same ring fits the 15 L and the 45 L pot, mains-powered or solar.

💧 The path of the solution

The pot works without a water pump. A small air pump sends air into the lift column sitting in the reservoir, and the rising bubbles carry the solution up with them to the tee of the ring. The solution then flows around the ring and escapes through its holes, before passing through the clay pebbles, wetting the roots and running back down to the reservoir by gravity. Because the ring spreads the flow around its full circumference, the grow medium stays evenly moist, and your roots develop throughout the whole volume of the pot instead of crowding to one side.

Rinsed clay pebbles keep the drilled holes open

Dust from new clay pebbles is the main reason a ring waters poorly, because it settles in the strainer and then in the drilled holes. Rinse the 8 to 20 mm clay pebbles until the water runs clear before putting them in the pot. That way you keep a steady flow all the way round the ring, and you avoid having to take it apart in the middle of a crop.

The solution must not touch the stem

Position the ring so that the solution falls onto the beads, away from the plant's crown. A stem that is watered constantly stays damp at its base, and crown rot can then spread to the whole plant. Check the ring's position after every intervention on the pot, as it moves easily when you handle the grow medium.

🔧 Replacing the ring

Replacement takes a few minutes and needs no tools. Switch off the air pump, lift out the tee from the airlift column, then fit the new ring in its place, following the tee orientation shown in the instructions. The small nipple on top takes the air line, and the 10 mm outlet slots onto the column. All that remains is to lay the ring flat on the clay pebbles around the plant, then switch the pump back on to check that every hole is flowing.

🧽 Clean before replacing

A ring that waters less effectively does not necessarily need replacing. The mineral salts in the solution gradually build up in the holes, and a night's soak in water with white vinegar added is often enough to dissolve them. Then rinse the ring in clean water and run a fine needle through any holes that remain blocked. You should replace it, however, as soon as it cracks, its tee breaks or it no longer holds its circular shape, since the water then no longer spreads evenly around the plant.

Technical specifications

The essentials

Diameter: 21 cmIt surrounds the base of the plant, resting on the clay pebbles.
Height: 4.5 cmT-fitting included.
Fitting: Male outlet of 10 mmIt fits onto the pumping column.
Compatible pots: 15 and 45 L potsMains and solar versions.

Material and reference

Material: Low-density polyethyleneFlexible, it springs back into shape after handling.
Colour: Brown
Reference: XXAL01017Reference H in the instructions for the 15 and 45 L pots.
Weight: 0.06 kgFor one ring.

In the box

1 or 4 distribution rings of 21 cm, depending on the bundle chosen

Dimensions, material, fitting, reference and compatibility taken from the spare part page and the instructions for the manufacturer's 15 and 45 L pots, on 07/10/2026.

Product videos

Assembling the 15 or 45 L hydroponic pot

Assembling the 4-pot linked kit

Documents & manuals

Instructions for the 15 and 45 L pots

The instructions point out the ring under the letter H and show at step 5 the correct way to fit its tee.

PDF · 0,9 Mo

Download

Estimate your
delivery time

A small, light parcel, 0.06 kg for one ring and 0.24 kg for the set of 4. The exact costs and final delivery times are shown in the basket once the address has been entered. Outside the European Union, import duties and taxes are payable by the recipient.

Frequently asked questions

6 questions

6 key questions

Does this ring fit the 15 L pot as well as the 45 L one?

How can you tell whether the ring needs replacing?

How do I fit the new ring?

How do I unblock the drilled holes?

Why should the solution avoid the stem?

What is the set of 4 rings for?

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Distribution ring for 15 or 45 L hydroponic pot

The summary