Now get your airstone and your caulk.

Put a dab of the caulk all around the base of the inlet shaft and don't be stingy, you want a good seal. And put some big gobs on the bottom of the airstone as well, it's gonna be an adhesive.

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"Sometimes I actually think I'm slightly retarded in the mouth." -Doug Wilson
DIY 3 gallon DWC bubbler tutorial - Diggitydank's 2nd DWC grow