A utility knife or a pair of secateurs will cut it cleanly. Cut straight across, because an angled cut is hard to push onto a fitting and lets air in.

Without pressure: on a siphon or a gravity-fed connection, pushing the pipe onto a barbed fitting is enough, as the ridges hold the pipe in place. Under pressure: at the pump outlet, add a clip sized to the 12 mm outside diameter, because the force of the water can push the pipe off the fitting.

50 m coil of flexible transparent 9/12 mm pipe with bluish highlights, wound in a ring on a white background

Flexible clear pipe 9/12 mm, by the metre or on a reel

Name: Flexible clear pipe 9/12 mm, by the metre or on a reel
Price: 300.0 RSD
Availability: InStock

300.00 RSD

100.00 RSD × 3 with no fees Klarna.

This flexible, transparent pipe, made of food-grade PVC with an inside diameter of 9 mm, is used to siphon, drain and transfer water from a tank, a pond or an aquaponic system. Its transparency lets you see the water moving, an air bubble sitting or a deposit building up. The pipe is sold by the metre or in a 50 m coil.

Hose

Length : 1 meter

1 meter

50 meters

Internal-External Diameter : 9-12mm

9-12mm

Customer support 7 days a week by email

Delivery within 2 to 15 business days

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The summary

What it is: a flexible food-grade PVC pipe, 9 mm inside diameter, 12 mm outside.
What it is for: siphoning a tank, draining the bottom, transferring water from one container to another.
Why clear: you can see the water moving, the air bubble staying put and the sediment settling.
The two lengths: the metre for occasional use, the reel for an installation.

A flexible, transparent pipe for siphoning, draining and transferring water

The 9/12 mm clear flexible pipe is a food-grade PVC pipe with a 9 mm internal diameter, designed for siphoning, draining and transferring water from a tank. Its transparent wall lets you see the water moving, along with air bubbles and deposits. It is sold by the metre for occasional use, or in a 50 m coil for an installation.

This pipe measures 9 millimetres inside and 12 outside, and is made of food-grade PVC. It is a handling diameter: wide enough for a siphon to prime and empty quickly, narrow enough to hold in one hand while you vacuum the bottom of a tank.

💧 Draining and refilling

The siphon works without a pump as long as the outlet end stays lower than the water surface in the tank and the intake end stays submerged: the water then flows by itself, and the flow rate increases with the difference in height between the two levels. To prime it, submerge the whole pipe in the tank until it is full, block one end with your thumb, then lift it out and place it in a 10.7 L food-grade bucket positioned lower down. One metre of this pipe holds only about 64 mL of water, so a 2 m length fills in a few seconds.

The siphon

A water change is done without a pump, with the bucket placed lower than the tank.

The bottom

The end passes between the decorations and sucks up waste where it settles.

Transfer

The water flows from one volume to the other, for example to a quarantine tank.

Filling

The return is done gently, without disturbing the grow medium as the water arrives.

This pipe goes with the porous disc

Its 9 mm inner diameter slides directly onto the fitting of the 20 cm diffuser disc, whose outlet measures 8 to 10 mm, with no reducer or adapter. The transparent wall lets you see at a glance whether the air is reaching the submerged diffuser. For high water flow rates, the spiral pipe takes over from 19 mm.

Priming the siphon without sucking by mouth

Sucking on the pipe by mouth to start the flow means swallowing tank water, which contains fish waste and is not drinking water. Filling by immersion avoids this. In a tank that houses fry or shrimp, also cover the suction end with gauze or a fine mesh, because a 9 mm passage will carry them away with the water.

🔍 What transparency reveals

Three things that stay hidden in an opaque pipe can be read in this one. You can follow the water while the siphon primes, instead of waiting without knowing. You can spot the air pocket that stays trapped in a loop and blocks the whole flow, and you can clear it by lifting the right point. Finally, you can see the brown deposit building up on the wall long before it narrows the passage, which tells you when to rinse the line rather than replace it. The article on cloudy water explains where the particles that form it come from.

🔗 Connecting and maintaining

The 9/12 mm size is also the pipe diameter used by small external aquarium filters, so you can replace a damaged length or extend a circuit on the same connector. To fit it onto a slightly tight ribbed connector, dip its end in hot water for 30 seconds: the PVC softens and slides over the ridges. On a permanent connection exposed to light, a film of algae eventually lines the inside of the wall, and it is precisely the transparency that shows it to you; a rinse with clean water, or a pass with a bottle brush, leaves the line clear. In aquaponics, this pipe is mainly used to purge the sludge that builds up at the bottom of a pond or a settling tank, by siphoning off the deposit without emptying the whole volume.

Technical specifications

The essentials

What it is: Flexible clear pipe
Internal diameter: 9 mm
Outer diameter: 12 mm
Material: Food-grade PVC

Both lengths

Per metre: 1 m, cut to orderFor a siphon or a short connection.
On a reel: 50 mTo equip an entire system in one go.

In the box

1 m of pipe, or 1 reel of 50 m, depending on the length chosen

Material and diameters taken from the pipe's technical data sheet, on 20/09/2026; contained volume calculated from the inside diameter.

Estimate your
delivery time

The metre ships as a light parcel, to a collection point or to your home, as you prefer. The 50-metre reel is delivered to your home. The exact amount appears in your basket.

Frequently asked questions

6 questions

6 key questions

What is the exact diameter?

Can it be connected to an aquarium air pump?

What can be passed through it?

By the metre or by the reel?

Is it easy to cut?

Is a clamp required?

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Flexible clear pipe 9/12 mm, by the metre or on a reel

The summary