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https://www.swelluk.com:443/swell-pond-ball-airstone-50mm/ 
Swell Pond Ball Airstone 50mm
Product Information
The Swell Pond ball airstone is a quality, economical pond air stone that will create a good stream of air bubbles. The blue airstone is 50mm in diameter and will accept standard 4/6mm airline.
- 50mm diamater
- accepts 4mm airline