We bought a 6 quart, 12 volt hydraulic pump system for our dump trailer. It got here quick and has given us no trouble after approx 6 months of use.We also bought another unit that looks very similar via Walmart online. We have had nothing but trouble from the Walmart unit and it cost us more. They agreed to refund us approx half the purchase price. Now what?Save yourself some trouble and buy one of these sold here. You'll be glad you did.