10" Air Stone to be used with the Alita AL-40. Manufactured under high tempeature and pressure Durable and washable Fit to be used in Acidic / Alkaline waters For aquarium, koi pond, and fish farm Picture represents multiple sizes. Price is per (1) 10" Air Stone. 10"AirstoneOur Price: $19.99Sale price: Most Orders Shipped Out Same Day! Premier Ponds LLC pondinfo@premierponds.com U.S.A. Copyright © 1999 - 2007 Premier Ponds LLC, North Salem, New York. All rights reserved. Thermo-Pond Heater 3.0, Aquascape Designs Pond Kits, ScareCrow Sprinkler, Nursery Pro Micro Pond Kits, AquaClearer, Microbe-Lift, Great Blue Heron Decoy, Pond Liners, Thermo Pond Heater & Deicer, Premium Koi Food, Select Koi, Butterfly Koi, Pond Aeration Pumps, Flexible PVC Piping, BioFalls, Skimmer, Aquascape Pumps, Cat Stop!, Animal Control Products, Pond Netting.