Standard 4mm airline tubing is a flexible, small-diameter pipe used to connect aquarium air pumps to air stones, sponge filters, and ornaments. Fits universal standard aquarium aeration fittings.

Key Facts:

• Size: 4mm inner diameter (fits standard 4mm to 6mm outlets)
• Common Materials: Clear or coloured PVC and soft, long-lasting silicone
• Main Uses: Fish tanks, hydroponics, and small pneumatic setups.

Compatible Accessories:

• Air Pumps: Drives air into the system
• Air Stones & Bubblers: Creates fine bubbles for oxygenation
• Check Valves & T-Pieces: Splits or prevents backflow of water
• Sponge Filters: Powers biological and mechanical filtration.