Alkin W31 Mariner 3.7 Vertical Compressor

Premium High-Pressure Air. EN12021 Certified. Built to Last.

The Alkin W31 Mariner is a premium, high-pressure air compressor engineered for reliability, performance, and long-term durability in demanding applications. With a compact vertical footprint that saves valuable floor space, a low-RPM three-stage reciprocating system that runs cooler and quieter, and clean breathable air output that meets EN12021 standards — the W31 is the serious fill solution for airgun shooters, scuba, paintball, and professional use who demand the best.

Overview

At the heart of the W31 Mariner is a three-stage, 1050 RPM reciprocating compression system — purpose-engineered to run at low RPM for reduced heat, quieter operation, and significantly longer service intervals than high-RPM alternatives. Capable of producing up to 5,000 PSI (345 bar) at 3.7 CFM, the W31 fills tanks quickly and efficiently while the integrated P21 filtration system and multi-stage moisture and oil separators ensure consistent, clean air purity throughout every fill. Stainless steel intercoolers and aftercoolers handle the thermal demands of continuous operation, making this a compressor built for serious long-term use.

Key Features

• Three-stage low-RPM (1050 RPM) reciprocating compression system
• 3.7 CFM fill rate for fast, efficient tank fills
• Maximum output: 5,000 PSI (345 bar)
• Air quality meets EN12021 Grade E and D standards — clean, breathable air
• Integrated P21 purifier with refillable purifier element
• 2nd and 3rd stage water condensate and oil separators
• Stainless steel intercoolers and aftercooler for superior thermal management
• Priority valve (pressure maintaining valve)
• Check valve and safety valve at each stage
• Automatic shut off with pressure switch
• Thermal overload protection for electric motor
• Oil level glass for easy monitoring
• Hour meter included
• Control panel with On/Off buttons
• Electrostatically painted portable chassis
• Filling hose with yokes, filling valves, pressure gauges, and DIN adapters included
• Compact vertical footprint for space-efficient installation
  
  

Performance Advantage

• Low 1050 RPM operation runs cooler and quieter than high-RPM competitors — extending service life and reducing maintenance intervals
• 3.7 CFM fill rate delivers fast, efficient fills for high-capacity tanks and frequent use
• EN12021 certified clean air output ensures safe, pure air delivery to your airgun or breathing apparatus
• Stainless steel intercoolers and aftercoolers handle continuous operation in demanding environments without thermal degradation
• P21 purification system with multi-stage moisture and oil separation ensures consistently clean, dry air output
• Automatic shut off and thermal overload protection provide hands-free safety during unattended fills
  
  

Build & Design

• Rugged, electrostatically painted portable chassis for long-term durability
• Compact vertical footprint minimizes required floor space
• Oil level glass allows quick, easy oil monitoring without disassembly
• Hour meter tracks service intervals for proactive maintenance scheduling
• Complete filling hose assembly included — ready to fill right out of the box
  
  

Specifications

What's Included

• Alkin W31 Mariner Vertical Compressor
• Filling hose with yokes, filling valves, pressure gauges, and DIN adapters
• Power cable

⚠️ Please inspect upon delivery. If the box has any visible damage, note it on the freight receipt and contact Alkin immediately at (201) 899-9675 while the driver is still present.

⚠️ Additional shipping charges may be collected for shipping to Hawaii, Alaska, Guam, and Puerto Rico.