Aluminum Pressure Canner, 23-Qt.Preserve with confidence! Pressure canning is the only canning method recommended safe by the U. S. D. A. for low acid foods such as vegetables, meats, and fish. The easy to read dial gauge automatically registers a complete range of processing pressures. Air vent cover lock allows pressure to build only when the cover is closed properly and prevents the cover from opening until pressure is safely reduced. Presto Pressure Canners also double as water