• Pressure range: 0 psi to 40,000psi (2,800bar)
  • Dual-piston pump to fill large volume systems
  • Patented screw press technology eliminates non-returning valve usually used on troublesome hand pumps
  • High pressures can be generated easily, as well as increased and decreased smoothly
  • Three hand-tight quick connectors allows easy connecting and disconnecting to the test pump
  • Media: Diethylhexyl Sebacate oil
  • Reservoir capacity: 420ml
  • Fine adjust piston: 1.5 ml
  • Material
    • Ram/adapters: Stainless steel
    • Body: stainless steel/aluminum, copper
    • Seals: Buna-N, PTFE, Copper Alloy, Aluminum Alloy
  • Durable and requires minimal maintenance

What's in the Box

  • Oil (Diethylhexyl Sebacate), 1 liter
  • Manual


The Additel ADT 959 Hydraulic Pressure Test Pump is a benchtop pressure pump designed to generate pressure to 40,000 psi (2,800 bar). This pump incorporates a dual-piston system which is ideal for filling large volume workload with the hand pump and providing smooth increase and decrease of pressure with the high pressure, fine adjust screw press. The ADT 959 test pump incorporates an isolation valve which isolates the calibration volume from the check valve associated with the hand pump. Because the check valve can often be a source of leaks and maintenance, the isolation valve provides more stable measurements and reduces potential maintenance of the pump. The Additel ADT 959 is an ideal comparison test pump for calibrating pressure measuring instruments such as test gauges, indicators or transducers.