EMAX 5 HP 80-Gallon 19 CFM Two-Stage Three-Phase Silent Air Vertical Air Compressor with 30 CFM Refrigerated Dryer, 208–230V, ESP05V080I3PK-208

The EMAX ESP05V080I3PK-208 is a complete shop air system that pairs a 5 HP, 80-gallon two-stage Silent Air piston compressor with a matched 30 CFM refrigerated air dryer. The compressor delivers 19 CFM and builds to a 175 PSI maximum pressure on 208–230V three-phase power, while the refrigerated dryer pulls moisture out of the air before it reaches your tools, lines, and finish work. It is built for stationary, continuous-duty use in a working shop.

This is a pressure-lubricated, 100% cast iron pump rated for an estimated 70,000-hour service life, carried on a vertical 80-gallon ASME tank. The package is ETL, ASME, and CRN certified and ships with a magnetic motor starter, dual-bolt belt tensioner, pump riser, and a dual-timer automatic tank drain.

Silent Air™ Noise Suppression

EMAX's patented Silent Air silencer system targets intake noise — the loudest source of compressor sound — to run up to 50% quieter, at or below conversational volume. Unlike fully enclosed cabinet systems that are costly and restrict service access, the Silent Air silencer keeps the pump, belts, and oil system fully accessible for routine maintenance. The intake silencer uses noise-reducing baffle plates and high-capacity filter media.

Pressure-Lubricated Pump

A gear-driven oil pump mounted to the rear of the crankshaft generates positive oil pressure, delivering a continuous flow of oil to every bearing point to keep components cool and extend pump life. Each crankshaft and connecting rod is rifle-drilled for direct oil flow to high-friction points, and a spin-on automotive-style oil filter keeps the oil clean. A liquid-filled oil pressure gauge lets the operator monitor oil pressure during operation, and an adjustable regulator tunes oil pressure across RPM ranges. Unlike splash-lubricated systems, pressure lubrication puts oil precisely where it is needed — the more effective method for high-duty-cycle, continuous-run service.

100% Cast Iron, Two-Stage Construction

All major pump components — crankcase, cylinders, cylinder heads, connecting rods, crankshaft, and high-pressure piston — are cast iron, with no aluminum sleeves beneath the paint. Cast iron handles high-duty-cycle compression and the heat it generates better than aluminum, holding rigidity and torque under demanding conditions.

Cast Iron Cylinders

The cylinders are CNC-machined for flatness and a precise, concentric bore that reduces oil carryover and supports long piston-ring life. Deep cooling fins maximize surface area to shed heat under high-duty-cycle operation, and deep-bored, threaded head holes allow proper torque for a lasting head-gasket seal.

Solid Cast Iron Cylinder Heads

Cast iron cylinder heads resist the head-gasket failures common to aluminum heads and provide stronger tapped holes for head retention. The precision-machined disc-valve design seals reliably without retorquing and allows quick valve inspection during service.

CNC-Machined Disc Valves

Precision surface-ground concentric ring (disc) valves seal better and last longer than the feather or fixed reed valves used on many pumps. Service is simple: remove the retainer, lift the valve for inspection, and reinstall within minutes.

Pistons and Connecting Rods

Cast iron high-pressure pistons are designed to carry heavy loads without scoring the cylinder. CNC-machined solid cast iron connecting rods provide rigidity at the crankshaft end, the point where aluminum rods commonly fail, and use replaceable bearing inserts and wrist pins so the rod assembly is fully rebuildable rather than throw-away. The low-pressure pistons on this two-stage pump are aluminum, where they run under low stress for balance and efficiency.

The four-ring piston design uses two oil-control rings to scrape excess oil on the downstroke and two compression rings to seal against blow-by. A rifle-drilled oil port carries oil through the crankshaft and up the connecting rod to the piston pin and bearing for continuous lubrication.

Cast Iron Flywheel

The heavy cast iron flywheel adds mass and kinetic energy to reduce amp draw and smooth operation. This 5 HP pump carries a 16-inch flywheel driving two B-style groove belts, with large cooling fins that pull air across the pump and oil reservoir for added cooling.

Continuous-Run Head Unloaders

As a fully packaged electric unit, this compressor includes head unloaders for continuous-run operation. When tank pressure reaches its setpoint, the pilot valve unloads the compressor and holds the intake valve open so the motor keeps running instead of repeatedly starting and stopping under load. That circulates cool air through the cylinder, reduces wear, and protects the motor and magnetic starter — the reason head unloaders are recommended for electric units at 40% or higher duty cycle.

Dual-Bolt Belt Tensioner and Pump Riser

A dual-bolt belt tensioner makes belt adjustments precise and keeps the pulleys aligned at the correct tension — no pry bars required — for longer belt life and easier service. The pump mounting riser raises the pump for 360-degree airflow from the flywheel over the oil reservoir and underneath the pump for maximum cooling.

Dual-Timer Automatic Tank Drain

An electric dual-timer auto drain expels moisture and condensate from the tank automatically, with an adjustable interval from 1 to 45 minutes and an adjustable open duration. An included air muffler keeps the discharge quiet.

Refrigerated Air Dryer

The included 30 CFM refrigerated air dryer removes moisture from the compressed air to protect tools, lines, and spray work. It carries a built-in prefilter rated at .001 micron and a coalescing prefilter rated at .005 micron.

• 5 HP, 80-gallon two-stage Silent Air piston compressor
• 30 CFM refrigerated air dryer with built-in prefilter and coalescing prefilter
• Magnetic motor starter
• Dual-timer automatic tank drain with muffler
• Dual-bolt belt tensioner
• Pump mounting riser

The compressor carries a 1-year standard warranty covering defects in material, workmanship, and parts from the date of delivery, including one year of warranty labor from an authorized technician. Standard warranty requires no registration and expires one year from delivery.

The standard warranty extends to a full 5 years when you register the compressor at emaxwarranty.com, use EMAX SMART Oil, and follow the required maintenance schedule: change the factory break-in oil within 70 hours of run time, then change the oil every 6 months or 1,000 hours of operation with EMAX-approved oil, keeping the oil at proper level.

The included refrigerated air dryer carries its own 1-year standard warranty, extendable to 3 years with registration and one annual dryer filter replacement kit. The EFKIT008AWBS extended-warranty kit (sold separately) supplies the SMART Oil and filters specified for 5–10 HP Silent Air electric models.

What electrical service does this compressor need?

It runs on 208–230V three-phase power with a full-load draw of 14.5 A (1.15 service factor) and a 91 A locked-rotor/peak-starting draw. A 30 A breaker is recommended. A magnetic motor starter is included.

Can it run continuously?

Yes. It is a pressure-lubricated, continuous-run unit with head unloaders and a 60% duty cycle, built for sustained shop demand rather than intermittent use.

Does it come with an air dryer?

Yes. A 30 CFM refrigerated air dryer ships with the package to remove moisture from the compressed air, with a built-in prefilter and coalescing prefilter.

How loud is it?

The patented Silent Air silencer system reduces intake noise to run up to 50% quieter, at or below conversational volume, while keeping the pump and belts accessible for service.

What maintenance keeps the warranty valid?

For the extended compressor coverage, change the break-in oil within 70 hours, then service the oil every 6 months or 1,000 hours with EMAX-approved oil, maintain proper oil level, and register at emaxwarranty.com. The dryer’s extended coverage requires one annual filter replacement kit.

This system ships freight, crated on a pallet; the carrier contacts you to schedule delivery. For freight quotes, three-phase power questions, or order help, contact sales@mygaragesupplies.com or call 307-381-1810.

• Piston Compressor Manual (PDF)
• Refrigerated Air Dryer Manual (PDF)
• Compressor Warranty Statement (PDF)
• Air Dryer Warranty Statement (PDF)