Air Powered vs Cordless Grease Gun: Which One Should You Buy?

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air powered vs cordless grease gun: how they differ

An air-powered grease gun is a pneumatic tool: it needs a compressor and an air hose, and it greases with trigger pulls for as long as the air supply holds. A cordless grease gun is a battery tool: it needs a charged pack, and it greases anywhere, with no compressor and no air hose in the way. Pressure is where the listings split most sharply, and hose length is the other big split.

The table uses the listings in the gear section below. The air guns both list 6,000 PSI, while the cordless gun lists 12,000 PSI, and the cordless hose is far longer than the 18-inch hose in the VEVOR listing.

The gear: three grease guns, ranked

First, the DIYtoolifz Cordless Grease Gun. It runs on DeWalt 20V battery packs, with a 4.0Ah or higher capacity battery recommended for maximum 12,000 PSI pressure, and it delivers a fast 8 oz/min flow rate. The 2-in-1 rotating handle switches between a pistol grip for tight spaces and a straight grip for long reach, and a built-in LED light illuminates dark, hard-to-reach areas. The kit includes a 39.4-inch flexible hose, 4 couplers, a shoulder strap and a hard carrying case, and it accepts standard 14 oz cartridges or bulk grease in NLGI #0, #1 and #2. It is sold as a bare tool, with battery and charger not included, so it suits someone who already owns DeWalt 20V packs. Skip it if there is no DeWalt 20V battery in the shop.

Second, the VEVOR Grease Gun. This air-operated gun delivers up to 6,000 PSI and pushes high-viscosity lubricants through stubborn grease fittings, with high-speed injection at 9.7 g/s from a trigger pull. A dual-sealing system with an explosion-proof carbon steel tube and an o-ring piston keeps the seal tight under high pressure. The kit includes an 18-inch flex hose, a metal bend pipe and two flat nozzles, and it takes standard 14 oz grease cartridges or bulk filling. It weighs 3.31 pounds. It suits a shop with a compressor already running and a repair bay full of fittings to hit. Skip it if there is no air supply where the greasing happens.

Third, the AZUNO Pneumatic Grease Gun. This air gun is rated at 6,000 PSI, with a canister built from cold drawn steel tube that stands up to 6,500 PSI pressure, and a second-generation AZUNO coupler upgraded to 12,000 PSI that fits 1/8-inch NPT grease gun fittings. Loading is three-way: standard 14 oz cartridges, suction or bulk filling, and the barrel has knurling for a non-slip grip with a non-slip rubber grip. It weighs 3.32 pounds. It suits automotive, trailer, agriculture, industrial and marine greasing from shop air. Skip it if cordless freedom matters more than shop-air power, since it needs a compressor like the VEVOR gun.

Air supply and batteries

An air gun is only as good as the air behind it. The VEVOR gun connects to an air source and greases on trigger pulls, and the AZUNO gun is an air compressor grease gun, so both assume a compressor is already in the shop. A cordless gun assumes the opposite: the DIYtoolifz gun assumes DeWalt 20V packs are already owned, recommends a 4.0Ah or higher capacity battery for maximum pressure, and ships without battery or charger. Count the power already in the shop before choosing: a compressor on the wall points to air, and a shelf of DeWalt 20V packs points to cordless.

Pressure and flow, without converting units

The listings state pressure and flow in different units, so compare each gun on its own figures. The VEVOR gun lists up to 6,000 PSI with injection at 9.7 g/s. The AZUNO gun lists a 6,000 PSI range, a canister that stands up to 6,500 PSI, and a coupler upgraded to 12,000 PSI: the coupler rating is not the gun output, so read it as coupler strength, not gun pressure. The DIYtoolifz gun lists 12,000 PSI with an 8 oz/min flow rate. Higher pressure helps with stubborn fittings and heavy equipment, and the cordless gun lists the highest pressure here.

Hoses, couplers and loading

Hose length decides how far the gun reaches while greasing. The VEVOR kit includes an 18-inch flex hose with a metal bend pipe and two flat nozzles. The DIYtoolifz kit includes a 39.4-inch flexible hose with 4 couplers: a 90-degree coupler, a lock-on coupler, a pointed tip coupler and a standard coupler. The AZUNO gun uses a professional coupler with a smooth retraction mechanism for one-hand operation. Loading is easy on all three: each takes standard 14 oz cartridges, the VEVOR and DIYtoolifz guns also take bulk grease, and the AZUNO gun adds suction filling as a third way.

High pressure deserves respect

At the pressures these guns reach, a leak at a fitting can inject grease through skin. Keep hands away from the coupler and fittings while the gun is pressurized, and check hoses and couplers for damage before use. Never point a pressurized gun at skin, and relieve pressure before changing a coupler or cartridge.

FAQ: garage tools

Do I need an air compressor for an air-powered grease gun?

Yes. The VEVOR gun connects to an air source for its power, and the AZUNO gun is described as an air compressor grease gun. Without a compressor and air hose, an air gun has nothing driving it.

Does the cordless grease gun come with a battery?

No. The DIYtoolifz gun is sold as a bare tool, with battery and charger not included. It works with DeWalt 20V battery packs, and the listing recommends a 4.0Ah or higher capacity battery for maximum 12,000 PSI pressure.

What grease cartridges do these guns take?

All three take standard 14 oz cartridges. The VEVOR gun also supports bulk filling, the DIYtoolifz gun takes cartridge or bulk grease in NLGI #0, #1 and #2, and the AZUNO gun offers three-way loading: cartridge, suction or bulk filling.

Which grease gun has the highest pressure?

The DIYtoolifz cordless gun, at 12,000 PSI. The VEVOR and AZUNO air guns list 6,000 PSI. Note the AZUNO coupler is upgraded to 12,000 PSI, but that is the coupler rating, not the gun output.

Can an air grease gun handle thick grease?

The VEVOR listing says its gun pushes high-viscosity lubricants and overcomes resistance from stubborn grease fittings, for full injection of lubricant. The AZUNO listing describes heavy-duty use for automotive, agriculture, industrial and marine equipment.

Related: the air compressors hub, the air tools hub and the cordless tools hub.