MK3-QS MARK-3® Backpack Portable High-Pressure Pump 4-STG


Always the benchmark in terms of performance, reliability and durability, the MARK-3® benefited from a series of improvements to its key components namely a Nikasil-coated cylinder, an impregnated crankcase and a maintenance-free pump end.

The new Nikasil Coated Cylinder is the most significant upgrade on the MARK-3® in years. In addition, WATERAX has adjusted its recommended fuel mix ratio to 50:1 synthetic. Please note that the change to the synthetic 50:1 fuel mix ratio is also valid for older MARK-3® equipped with cast iron sleeve cylinders.

The improved MARK-3® successfully passed the USDA Forest Service 100 hours endurance test in San Dimas on 08/04/15 and has been requalified under QPL Number 274-001.

MARK-3® meets or exceeds USDA Forest Service SPECIFICATION 5100-274E.Exempt from emission standards under 40 CFR 1054.660NSN 4320-00-890-5879

• Attack line firefighting
• Long hose lay for remote watering during firefighting operations
• High-elevation firefighting in mountainous areas
• High pressure provides accuracy in flow trajectory
• Tandem pumping over long distances
• Parallel pumping for higher volumesFeatures & Benefits
• Quick-release clamp and detachable pump end for minimal equipment downtime and inventory
• Sealed bearing to eliminate pump end greasing in the field
• Aluminum alloy pump components and anodized parts for lighter weight and greater resistance to corrosion



Maximum Pressure: 380 PSI (26.2 bar)
Maximum Flow: 98 US gals/min (371 L/min)
Maximum Head: 878’ (268 m)


78 GPM (295 lpm) @ 100 PSI (6.9 BAR)
65 GPM (246 lpm) @ 150 PSI (10.3 BAR)
38 GPM (144 lpm) @ 200 PSI (13.8 BAR)


Model & Type: WATERAX 185cc, 2-cycle, air-cooled, Nikasil cylinder
Maximum Power: 10 hp (7.5 kW) @ 5,500 rpm
Maximum Torque: 8.9 lb-ft (12 Nm) @ 5000 RPM
Starting System: Recoil starter with backup manual rope starter


Type: Detachable 4-Stage Centrifugal Pump
Intake: 2” Male NPSH
Discharge: 1-1/2” Male NPSH


Weight: 58.3 lbs (26.4 kg)


Backpackable Frame


Direct Drive


Fuel Connector: SAE 45 (Standard)
Thread Protector: Suction: 1-1/2″ NH (Standard)
Thread Protector: Discharge: 1-1/2″ NH (Standard)

Additional information

Weight 65 lbs
Dimensions 23 × 19 × 25 in


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