vevor hydraulic pump, 4 quart hydraulic power unit, single acting dump trailer pump, 0.91 gpm flow rate, 3200 psi max relief pressure, dc 12v hydraulic pump for dump trailer car lifting 4 quart single acting single acting is up for auction in Industrial & Scientific. The current bid is $3.00, 98% below the $172.82 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.