PondMaster AP-20 aeration kit. Provides vital oxygen to fish, plants, and other pond wildlife. Easy to install, includes everything needed to aerate a pond. Aerates ponds up to 2000 gallons. Contains (1) AP-20 air pump, (3) 16\’ sections of air line tubing, (1) 6 port manifold, and (6) 4\” air stones. Also improves overall pond water quality. 6\” W x 7\” H x 9\” L.