Air Stones Item # Description C30D-104C 4 Inch Cylindrical Air Stone C30D-106C 6 Inch Cylindrical Air Stone C30D-108C 8 Inch Cylindrical Air Stone C30D-112C 9 Inch Cylindrical Air Stone Air Manifolds Item # Description AP-6 6 Outlet Plastic Air Manifold for 3/16 inch airline tubing AP-8 8 Outlet Stainless Steel Air Manifold for 3/16 inch airline tubing SPALM10 10 Outlet Plastic Air Manifold for 3/16 inch airline tubing About US | Contract Info | Water Plants | Pond Supplies | Pond Planner | PDF Catalog | Customer Login Updated July 20, 2009 2:47 PM