Nuvair EK76-Q325D Kubota Diesel LP Nitrox Surface Supply System

The EK76-Q325D low pressure (LP) nitrox production system is a self-contained, portable, delivery package capable of supplying air or enriched air nitrox up to 40% (EANx40) to surface-supplied divers. The turnkey system utilizes two LP compressors that are 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: BP 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 in 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
  • BP 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 eyes
  • Pro CO2 analyzer with audible alarm
  • Pro CO analyzer with audible alarm
  • Low/high O2% shutdown and alarm
  • 60 gallon volume tank upgrade
  • 250 psi (17 bar) discharge pressure


SKU: 7069D-EK76-325
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)