2.5 m coil of grey flexible pipe with its label, 12/16 mm diameter

2.5 m coil of grey flexible pipe in the large diameter, with its label

Grey 12/16 mm pipe in a coil, original packaging

Grey 19/27 mm pipe in a coil, original packaging

Coil of JBL grey pipe 9/12 mm, 2.5 m, with its label

Coil of JBL green pipe 9/12 mm, 2.5 m, with its label

Coil of grey JBL 16/22 mm pipe, 2.5 m, with its label

JBL flexible pipe in grey or green for filter and pump, 2.5 m

Name: JBL flexible pipe in grey or green for filter and pump, 2.5 m
Brand: JBL
SKU: J6108700
Availability: InStock

$6.75

$2.25 × 3 with no fees Klarna.

This flexible PVC pipe connects a pump, a filter or a steriliser to your tank, in an aquarium, a pond or an aquaponics system. Its grey, translucent tint lets you see the water flowing while limiting algae on the inside wall.

It is supplied in 2.5 m coils, in grey from 9/12 to 19/27 mm and in green in the 9/12 mm diameter.

Ref. J6108700·Piping

Diamètre : 9/12 mm

9/12 mm

12/16 mm

16/22 mm

19/27 mm

Couleur : Gris

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Delivery within 2 to 15 business days

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The summary

What it is: a flexible, translucent PVC pipe, supplied in a 2.5 m coil, that carries water between a pump, a filter and a tank.
The four diameters: 9/12, 12/16, 16/22 and 19/27 mm, for outlets from 9 to 20 mm.
Which pipe for which outlet: the outlet of your pump or filter decides, and the first number of the pipe must fit snugly over it.
Grey or green: grey blocks some of the light that would turn the inside of the pipe green, and the 9/12 mm is also available in green.
How to choose: the 2.5 m coil suits short runs, while pipe by the metre suits long ones.
How it arrives: rolled into a coil in a small parcel, delivered to your door.

Translucent flexible pipe in a coil, for pump, filter and grow bed

Between a pump and a grow bed, or between an aquarium and its external filter, the water almost always travels through a flexible pipe. This one is made of translucent PVC, free of heavy metals, and is supplied in a 2.5 m coil that you cut to the length you need. Its four diameters, from 9/12 to 19/27 mm, match the most common families of fittings on aquarium pumps and filters, and you can use it in freshwater and in seawater.

🔬 Material and colour

The PVC of this pipe resists salt, acids and bases as well as ozone, so it copes with seawater or an acidified nutrient solution. Its colour plays a specific role: in a clear pipe, light encourages algae to grow on the inner wall, to the point of narrowing the bore. Translucent grey filters out part of that light and noticeably delays their appearance, while still letting you see the water flowing or an air bubble trapped inside. The 9/12 mm size is also available in translucent green, which blends into the look of your planted aquarium.

📏 Four diameters, four families of nozzles

A flexible pipe is designated by its inside diameter followed by its outside diameter, and it is the first that must fit snugly over the ribbed outlet of your pump or filter. The 9/12 mm takes the 9 to 10 mm outlets of small pumps and internal filters. The 12/16 mm fits the 12 to 13 mm outlets, those of pumps from 300 to 600 L/h such as the 600 L/h submersible pump with adjustable flow and of JBL CristalProfi e401 to e901 filters. The 16/22 mm suits 16 mm outlets, and the 19/27 mm takes the 19 to 20 mm outlets of water pumps from 1,000 to 2,000 L/h. A pipe that is too narrow slows the water through friction, and the pump then delivers less than expected at the top of the circuit.

A barbed tee to supply two tanks

If your pump has to fill two grow beds, the 20 mm ribbed tee splits the flow from the 19/27 mm pipe between two outlets, with no drilling or glue. Its three ridged ends take a pipe with an inner diameter of 18 to 20 mm, which matches the larger diameter of this coil. You cut the coil into three lengths, and each bed receives its share of the water from a single pump.

Tighten a clamp at each end

Under the pressure of a pump, a pipe can slip off its nozzle, all the more quickly when the water is warm. Fit a hose clip on each end that sits out of the water, and let the pipe hang down without pulling it taut. Also avoid bends that are too tight, because a pinched pipe reduces the flow and the back-pressure it creates upstream can blow a fitting off.

In aquaponics, this pipe most often connects the pump in the fish tank to the grow bed placed above it, from where the water flows back down by gravity. Keep this run short and direct, since every metre and every bend adds resistance that your pump has to overcome. A small system, with a 100-litre tank and a 600 L/h pump, is fine with the 12/16 mm. Once the pump reaches 1,000 L/h, the 16/22 or the 19/27 mm lets it deliver its full flow. A biofilm of bacteria also forms inside the pipe, which is normal in a living system. The guide to building your aquaponic system describes the complete set-up, from the pump to the grow bed.

🧽 Pipe maintenance

Rinse a new pipe in clean water before fitting it, to remove manufacturing and storage dust. When the flow drops without the pump being at fault, pass a 16 mm brush through the larger diameters, then rinse the pipe with tank water to protect the beneficial bacteria. Outdoors, run the pipe in the shade, because flexible PVC hardens in the sun and then holds less well on its connectors.

🧭 Ring, roll or diffuser pipe

This 2.5 m coil suits short runs, from a pump to a filter or from an aquarium to its grow bed. For a longer circuit, you can order the flexible PVC pipe by the metre cut to the exact length, in 14 x 18 mm clear or 18 x 22 mm opaque black. The porous air diffuser pipe, on the other hand, does not carry water: connected to an air pump, it releases bubbles along its whole length.

Technical specifications

The material

Material: Flexible PVC, free from heavy metals
Shade: Grey or translucent greenGrey slows algae growth; green is also available in 9/12 mm

The diameters

9/12 mm: Inside 9, outside 12 mm9 to 10 mm nozzles
12/16 mm: Inside 12, outside 16 mm12 to 13 mm connectors
16/22 mm: Inside 16, outside 22 mm16 mm hose tails
19/27 mm: Inside 19, outside 27 mm19 to 20 mm connectors

Use

Length: 2.5 m in a coilCut it straight with a utility knife
Resistance: Salt, acids, bases, ozoneFreshwater, saltwater, pond

To budget for separately

Fixing: One clamp at each end
Flow split: 20 mm ribbed teeFor the 19/27 mm diameter

2 further specifications are available in the detailed view.

In the box

1 coil of pipe, 2.5 m long, in the diameter and colour of your choice

Material, resistance, colours and diameters recorded on 08 and 11/10/2026 from the JBL packaging and documentation. Outlet diameters of the pumps and filters recorded from the manufacturers' instructions.

A 2.5 m coil, or another pipe?

The four diameters in the range and two other flexible pipes in the catalogue, which differ in their end fitting, their length and what they carry.

Which pipe for your setup? What the pipe carries and the size of the nozzle to be fitted are enough to decide.

	9/12 mmYour choice	Recommended 12/16 mmYour choice	16/22 mmYour choice	19/27 mmYour choice	Flexible PVC pipe by the metre or on a reel, 3 diametersYour choice	Porous air diffuser pipe, 16 or 20 mmYour choice
Dimensions
Internal diameter (mm)	9 mm	12 mm	16 mm	19 mm	18 mm	12 mm
Outer diameter (mm)	12 mm	16 mm	22 mm	27 mm	22 mm	16 mm
Hose tail to fill	9 to 10 mm	12 to 13 mm	16 mm	19 to 20 mm	20 mm	12 mm
Length sold	2.5 m	2.5 m	2.5 m	2.5 m	Per metre	5 m
Use
Carries water from a pump or a filter	Yes	Yes	Yes	Yes	Yes	No
Diffuses air into the water	No	No	No	No	No	Yes
Price	$6.75	$11.33	$14.76	$21.62	$6.75	$14.30

9/12 mm

Dimensions

Internal diameter (mm)9 mm

Outer diameter (mm)12 mm

Hose tail to fill9 to 10 mm

Length sold2.5 m

Use

Carries water from a pump or a filterYes

Diffuses air into the waterNo

12/16 mmRecommended

Dimensions

Internal diameter (mm)12 mm

Outer diameter (mm)16 mm

Hose tail to fill12 to 13 mm

Length sold2.5 m

Use

Carries water from a pump or a filterYes

Diffuses air into the waterNo

16/22 mm

Dimensions

Internal diameter (mm)16 mm

Outer diameter (mm)22 mm

Hose tail to fill16 mm

Length sold2.5 m

Use

Carries water from a pump or a filterYes

Diffuses air into the waterNo

19/27 mm

Dimensions

Internal diameter (mm)19 mm

Outer diameter (mm)27 mm

Hose tail to fill19 to 20 mm

Length sold2.5 m

Use

Carries water from a pump or a filterYes

Diffuses air into the waterNo

Flexible PVC pipe by the metre or on a reel, 3 diameters

Dimensions

Internal diameter (mm)18 mm

Outer diameter (mm)22 mm

Hose tail to fill20 mm

Length soldPer metre

Use

Carries water from a pump or a filterYes

Diffuses air into the waterNo

Porous air diffuser pipe, 16 or 20 mm

Dimensions

Internal diameter (mm)12 mm

Outer diameter (mm)16 mm

Hose tail to fill12 mm

Length sold5 m

Use

Carries water from a pump or a filterNo

Diffuses air into the waterYes

Diameters, end fittings, lengths and uses taken from the product pages on 08 and 11/10/2026. The 9/12 mm is available in grey and in green. Sold by the metre: black 18 x 22 mm pipe, for circuits longer than 2.5 m.

Estimate your
delivery time

The pipe is dispatched within 48 hours, coiled in a small parcel, and delivered to your home by Colissimo or Chronopost, as you choose during checkout. The exact amount is shown in your basket, based on the total weight of your order.

Frequently asked questions

6 questions

6 key questions

Which diameter should I choose for my pump or filter?

The inside diameter of the pipe must match the outlet fitting, which you can read on the instructions or measure.

Equipment	Outlet	Pipe
Small pump or internal filter with a narrow outlet	9 to 10 mm	9/12 mm
Pump of 300 to 600 L/h, Sicce Micra or Mi Mouse, EHEIM compactON 300	12 to 13 mm	12/16 mm
JBL CristalProfi e401 to e901 external filter	12 to 13 mm	12/16 mm
EHEIM compactON 1000 pump, fitting trimmed back to 16 mm	16 mm	16/22 mm
EHEIM compactON 2100 pump	19 mm	19/27 mm
20 mm barbed tee	20 mm	19/27 mm

Does the grey pipe really stop algae?

Can it be fitted onto a 16 mm barbed fitting?

How do you fit it without forcing it or causing a leak?

Can it be used outdoors, on a garden pond?

What length should I allow for my circuit?

Let us talk about your project

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JBL flexible pipe in grey or green for filter and pump, 2.5 m

The summary