Airmax Eco-Systems was built on one simple philosophy “To Make Pond Care Simple”, Our staff has years of experience so you don’t have to, Although the products we manufacture are of the finest quality, we understand that our service and technical expertise must consistently surpass our customer’s expectations, 100% Satisfaction Guarantee:, All the products we manufacture have been thoroughly tested to ensure their performance, longevity and effectiveness, With this said you are the finial judge, if you are not completely satisfied Airmax and it’s authorized dealers will do whatever it takes to ensure your complete satisfaction, , Replaces out-of-date aeration stones, Virtually maintenance free - no more muriatic acid, Simply threads into your existing Airmax ProAir-4 Diffuser Plate, Includes: 4 Membrane Sticks and 6 Cable Ties, SKU: AES224