AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain If you already have your

If you already have your skimmer but it is not pre-drilled

Stops algae growth and works on string algae

The AquascapePRO® Dual Union Check Valve 2

Anjon weighted airline tubing can be used with any air pump that takes 3/8" or 5/8" tubing

Not compatible with Adirondack or New Hope style lawn chairs

AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain If you already have yourAquaDyne Retrofit Bottom Drains with Air Diffuser offer a quality innovation for a stable and rugged over the liner bottom drain for those who do not want to install a drain through a liner or for pre constructed ponds that do not have a bottom drain. This drain is especially useful for pond and aquatic environments that have preexisting liner, concrete, or any other situation that would not allow underground plumbing to be installed. Keeping solid