AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain and outer diameter buttress threads

and outer diameter buttress threads for union adaptors

and skim any dead algae from the water's surface to help prevent further growth

These replacement parts and accessories are for the Aqua Ultraviolet® Ultima II Filters

while the other systems are set up for 3/8" airline

CrystalClear® Barley Extract is a powerful liquid concentrate that goes to work fast

AquaDyne Heavy Duty RHINO Retro Bottom Drains with Air Diffuser Size:Replacement Air Disc for 3" Retrofit Bottom Drain and outer diameter buttress threadsAquaDyne 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