Lees Discard-A-Stone Fine Bubble

Lees Discard-A-Stones are disposable air diffusers with reusable inserts for attaching to the air line. The Fine Bubble Diffuser creates a flurry of small bubbles; for larger bubbles, use Lees Coarse Bubble Diffusers.
Excellent aeration device for all aquariums
For use in under gravel filters, corner filters or just as decorations.
Safe for fresh and saltwater aquariums
Includes: 6 stones and 4 inserts.