Air stone distribute fine bubble into the water when used in conjuction with a pond or aquarium air pump. The Kockney Koi 50mm Ball Air Stone is a large air stone ideal for fish ponds. Made from a tough and heavy ceramic compound the air stone will sink to the bottom of the pond with ease. Once connected to a standard 4mm airline hose the air stone will add extra oxygen into the water.
Size: approx 40m x 50mm(1.5"x2")
Fits 4mm internal diameter air line