EK76-Q325D Kubota Diesel LP Nitrox Surface Supply System

The EK76-Q325D low pressure (LP) nitrox production system is a self-contained and portable delivery package capable of supplying air or enriched air nitrox up to 40% (EANx40) to surface supply divers. The turnkey system utilizes two low pressure compressors mounted together with a 37.4 hp (28 kW) Kubota diesel engine along with a permeable membrane system in a powder-coated steel frame. The system components include: back-pressure regulator, low pressure air filtration, gas stream temperature stabilizer (heater), permeable membrane, mixing tube, air intake filter, inline sensor/oxygen analyzer, compressor intake porting and two LP compressors. All of the component assemblies and parts are mounted to facilitate easy setup, operation, and transport.



  • Powder-coated steel frame and belt guard
  • Stainless steel 1/4" compressor mounting plate
  • Vibration isolation mounts
  • Rotary screw compressor with modulation device
  • Hour meter/tachometer
  • Low oil shutdown (Kubota engine)
  • High temperature shutdown (Kubota engine) + EK76 compressor
  • Two (2) 30 gal ASME volume tanks with drain and gauge
  • Certified 13 gal fuel tank

Nitrox Membrane System

  • Pro O2 analyzer
  • Pro O2 analyzer with in-line sensor
  • Auto thermostat control heater
  • Back pressure air flow regulator and O2% control
  • Air intake filter and static mixing tube
  • Synthetic food-grade compressor lubricant
  • Mix accurately within 0.1%


  • Certified lifting frame
  • Pro CO2 analyzer with audible alarm
  • Pro CO analyzer with audible alarm
  • Low/high O2% shutdown and alarm
  • 250 psi (17 bar) discharge pressure


Engine Kubota D1803 Diesel
Engine Power 37 hp (28 kW), 2400 RPM
Maximum Block
Output Pressure
200 psi
(14 bar)
Maximum Block
Rated Output
18.6 CFM @ 175 psi
(527 L/min @ 12 bar)
Final System
Discharge Pressure
155-200 psi
(11-14 bar)
Quincy 325 Stages 2
Quincy 325 Cylinders 2
Package Free Air
Delivered Maximum
18.6 SCFM @ 40% nitrox
(527 L/min)
Condensate Drain Tanks: Manual
Filtration: Auto
Lubricant Nuvair 546 (EK76)
Nuvair 455 (Q325)
(L x W x H)
76 x 46.5 x 70 in
(193 x 118 x 178 cm)
Weight 2150 lb (975 kg)