Everything you need, including winter resistant airline, preassembled check valves, and weighted air stones. These replacement parts bring the Aquascape® Pond Aeration Kits back to peak performance! The Aquascape® Pond Aeration Kits for Small Ponds will effectively oxygenate your pond, helping all biological processes and creating a more stable environment, resulting in healthier fish and plants. The Aquascape Pond Aerator Replacement Disc is designed for use with the Aquascape 2-Outlet and 4-Outlet Pond Aeration Kits. but can be used with almost all traditional aquarium and pond aerators or air pumps. The Aquascape Pond Aerator Replacement Aeration Disc is used conjunction with an aerator or air pump to help provide proper aeration, improving water quality and fish health.