4mm/8mm Standard Sinking Airline

4mm/8mm Standard Sinking Airline

Reliable weighted PVC airline for ponds, koi ponds and aquariums

4mm/8mm Standard Sinking Airline is a weighted air hose designed to remain beneath the water instead of floating across the pond surface. It is suitable for connecting pond air pumps to air stones, air diffusers, aerated filters and other pond oxygenation equipment.

The weighted PVC construction allows the airline to sink naturally and follow the contours of the pond floor. This removes the need to attach separate airline weights and helps create a neater, less visible installation. The black finish also blends discreetly against pond liners, pond bases and dark aquarium backgrounds.

This sinking airline is supplied by Air Aqua on a practical roll that can be handled and stored easily. Distance markings are printed along the hose, allowing the required length to be measured and cut directly from the roll. This is particularly useful for pond installations where several different airline lengths are required.

The airline is available with either a 4mm or 8mm internal diameter. The 4mm version has an outside diameter of approximately 8mm and is supplied on a 200m roll. It is suitable for smaller air pumps, individual air stones, aquariums, quarantine systems and compact pond aeration installations.

The larger 8mm version has an outside diameter of approximately 12mm and is supplied on a 100m roll. It is designed for pond air pumps, larger air stones, diffuser systems and installations requiring greater airflow. Air Aqua recommends an airflow of approximately 15 litres per minute through the 8mm airline, with a stated operating range between 10 and 25 litres per minute.

Good pond aeration helps support fish, beneficial filtration bacteria and overall water quality. Oxygen becomes particularly important during warm weather because warmer water naturally holds less dissolved oxygen. Rising bubbles also encourage water circulation by drawing deeper pond water towards the surface.

View the Evolution Aqua Premium Heavy Duty Sinking Airline for the premium heavy duty option.

Key benefits

• Weighted airline designed to sink below the water surface
• Helps prevent airline floating across the pond
• No separate airline weights required
• Manufactured from durable PVC
• Supplied on practical rolls
• Distance markings make measuring and cutting easier
• Available in 4mm and 8mm internal diameters
• Suitable for ponds, koi ponds and aquariums
• Suitable for air stones, diffusers and aerated filters
• Discreet black finish
• Helps create a tidier aeration installation

Available models

4mm sinking airline

• Internal diameter: 4mm
• Outside diameter: Approximately 8mm
• Full roll length: 200m
• Suitable for smaller air pumps, aquariums and individual air stones

8mm sinking airline

• Internal diameter: 8mm
• Outside diameter: Approximately 12mm
• Full roll length: 100m
• Suitable for larger air pumps, large ponds and air diffusers

Technical specifications

• Manufacturer: Air Aqua BV
• Brand: Air Aqua
• Material: PVC
• Colour: Black
• Available internal diameters: 4mm and 8mm
• Full roll lengths: 200m and 100m
• Distance markings: Yes
• Additional weights required: No

8mm 100m roll information

Quantity per packaging: 1 × 100m roll

Weight: 14.5kg

Packaging dimensions: 360 × 360 × 270mm

EAN: 8717591055518

Important ordering information

All airline is supplied in the selected length.

Where multiple cut lengths are ordered, they will be supplied as separate lengths rather than as 1 continuous piece.

For example, ordering 2 × 30m lengths will provide 2 separate 30m lengths rather than 1 continuous 60m length.

Customers requiring a complete continuous roll should select the relevant 100m or 200m roll option.