pawfly 16 inch air stone cylinder for larger pumps bubble diffuser release tool for large aquariums outdoor pond garden circulation systems and dwc reservoirs, 2 pack 2 pack 16 inch is up for auction in Patio, Lawn & Garden. The current bid is $1.00, 97% below the $36.99 MSRP, in As Is condition. Bid on this item at our Georgetown - Triport Road location before the auction closes.