Description Specifications Literature Description Haskel EXT420 is a pneumatically driven single stage, double acting R600 butane refrigerant transfer pump. Haskel EXT420 high-pressure, positive-displacement two-stage piston pumps are safe, proven, reliable, and energy saving butane / propane extraction pumps. The high-pressure pumps offer the flexibility to speed completely variable from zero to maximum lbs/minute. No need for unloaders or bypass valves, simply add gauges and hoses to suit your application. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Product Specifications Pump Ratio4:1 Pump Displacement per Cycle20 cu. in. Drive Size5 ¾ in. Max Outlet Pressure1250 PSI SealsViton Wetted Section MetalsStainless Steel Literature & Docs Product Drawing Data Sheet Accessories