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I've been using Whisper 10 1.5 watt air pump designed for aquariums up to 10 gallons.
It worked well for many years.
The ends of connected tubes wear out noticeably over time.
Usually I cut off the loose part.
It's an easy fix that can be repeated until you run out of tube to cut.
An inline straight connector comes to mind.
And you may find one amongst used pens and mechanical pencils.
Look for a conical tipped pen with a smooth surface.
The tube should fit tightly inside of the tip from the wide side of it.
The tip of the pen should fit tightly inside of the tube.
Keep in mind - it is not the most reliable connector!
Nevertheless, it works in a pinch for low air pressure, when you are in rush to add air to your aquarium!
It even works with a number of connectors on one tubing line.
Here is an example where I use a straight connector on a tubing line between an air pressure valve and an air stone,
Works like a charm.
Have fun and happy aquarium :)
More fun on my website www.fewdoit.com
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