Hydraulic Trailer Jacks (Twin) Kit. Premium Supply Double Hydraulic Trailer Jack Kit Kit Includes: (2) 12,000 lb Trailer Jacks With 2 x 20 Hydraulic Cylinder. (1) Double Acting Pump with 3200psi relief setting on the extend (raising) port and 1500psi relief setting on the retract (lowering) port, (1) Plumbing Kit, (1) 32 oz Johnson Trailer Parts Double Wall Insulated Mug Lift your heavy duty trailer at the push of a button. If you need to build a trailer or replace existing jacks, these hydraulic jacks are perfect for most applications with livestock, horse, vehicle, cargo, dump or even flatbed gooseneck trailers. KTI Hydraulic Pump - Double Acting Search "Johnson Trailer Parts " in Amazon Search Bar for more Trailer Parts