AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain Each cup treats 6

Each cup treats 6

Stops algae growth and works on string algae

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

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

5" Union - threaded fitting on filter (collar & PVC fitting) K+3000 & K+4800 Models    (16"-20" Diameter) CE04120502 2" Union - threaded fitting on filter (collar & PVC fitting) K+9600

AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain Each cup treats 6AquaDyne 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