Hydro test cart: Assembled into robust dolly frame ideal for providing hydrostatic pressure for a wide range of pressure testing applications on the all industries including Oil and Gas. This serie offers 9 models from 500 psi up to 45,000 psi for use with a wide range of fluids: water, oils, hydraulic and many more. Heavy Duty Dolly 1000 LBS Solid Rubber Tires.