What size airline ? The one suggested by amazon is too small .

This air stone matches two size air tubes, 3/16 " and 3/8". Wet the airline with water. It might be easier to install.

How many leters per min?

You’re better off with the pawfly 8” cylinder. These deteriorate extremely fast as if the material they used is insufficient.

Yes they do sink. Also check out pawfly 8” cylinders. I tried the synthetic pawfly black 8” and I think its cheaply made so I’ll be sticking with the original blue 8” pawfly airstone cylinders.

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Description

💨 Elevate your aquatic vibe with bubbles that mean business!

DUAL PACK ADVANTAGE - Two premium air stones included—double the oxygen, double the vitality for your aquatic ecosystem.
UNIVERSAL TUBING FIT - Seamlessly connects with both 3/16” and 3/8” inner diameter tubes for versatile setup options.
OPTIMIZED BUBBLE FLOW - Engineered for consistent, fine bubbles that boost oxygenation and keep aquatic life thriving.
DURABILITY MEETS DESIGN - Robust shell guards the mineral stone, ensuring long-lasting performance in any hydroponic or aquarium environment.
EASY MAINTENANCE ROUTINE - Simple soak and brush cleaning keeps your system running smoothly and your fish happy.

The ALEGI Air Stone Cylinder Bubbler is a 5.3-inch mineral stone diffuser designed for hydroponic systems, aquariums, and fish tanks. Compatible with 3/16” and 3/8” tubing and requiring a minimum 4W air pump, it features a durable protective shell and comes in a convenient 2-pack. Regular soaking and cleaning ensure optimal bubble production, promoting healthy fish respiration and vibrant aquatic environments.