lemcoseals.com
Lemco Seals, Inc. - Lemco Seals stop submersible water well pumps from sucking air | Lemco Drawdown Well Seals | Lemco Seals, Inc.Stop submersible water well pumps from sucking air by forming an airtight seal above the pump to control drawdown, increase water well production, retard corrosion buildup and eliminate wash down of rust and slime.
http://www.lemcoseals.com/