At Bison Pumps, we heard your need. You asked for a high volume, frequent-use pump for long-term water outages, communal water needs, off-grid living, or for agricultural applications. The Bison Commercial Pump with its 3" cylinder yields an easy to pump 12 gallons per minute. The weighted T-handle makes pumping easy and comfortable even to deeper static water levels as far as 300'. Like all Bison Pumps, these pumps are self-priming and can be used to pressurize a tank or pump uphill to storage. All commercial pumps come standard with Bison's tamper-proof well adapter. Cylinder sizes range from 1 1/2" - 3" for various static water levels and ease of pumping. These hand pumps may be center or off-set mount to accommodate electric pumps in the well.