Umarex PAC 400 Performance Air Compressor

• Manufacturer: Umarex
• Model: PAC 400 Performance Air Compressor
• Manufacturer item number: 2.0051
• Compressor type: Portable high-pressure PCP air compressor
• Power supply: 18V lithium-ion rechargeable battery
• Included battery: 1 × 18V 5.2Ah lithium-ion battery
• Included charger: 1 × compatible battery charger
• Battery mounting system: Makita-compatible standard
• Maximum filling pressure: 300 bar
• Maximum filling pressure: 4,350 psi
• Maximum supported reservoir volume: 1 litre
• Reference filling time: Approximately 11 minutes 30 seconds for 0.2 litres at 190 bar
• Noise level: Approximately 80 dB
• Automatic shut-off: Yes
• Pressure adjustment: 1-bar increments
• Display: Digital
• Overheat protection: Yes
• Compressor lubrication: Oil-free
• External water cooling: Not required
• Air filtration: Replaceable sponge filter
• High-pressure connection: Foster
• Included adapters: 1/8", M10 and M10x1
• Dimensions (L × W × H): 370 × 90 × 185 mm
• Weight: Approximately 6.1 kg
• Intended use: Filling compatible PCP airgun reservoirs

Actual filling times and battery runtime depend on reservoir capacity, starting pressure, target pressure, battery condition and operating conditions.

The main advantage of the PAC 400 is its rechargeable battery power system, which allows PCP airguns to be filled without requiring access to a mains electricity supply during operation.

The standard package includes one 18V 5.2Ah lithium-ion battery and one compatible charger, providing the essential equipment required for battery-powered operation.

The compressor uses a Makita-compatible battery mounting standard. This may offer additional flexibility for users who already own suitable batteries using the same connection system.

Optional battery adapter sets are available for certain other tool battery platforms, including Black & Decker, Bosch, Einhell, Metabo and Parkside. These adapters are separate accessories and are not included in the standard PAC 400 package.

Battery compatibility should always be checked carefully before use. Matching the physical mounting arrangement does not automatically guarantee compatibility with every battery model.

The PAC 400 is particularly useful for shooting ranges, outdoor practice locations and mobile filling applications where mains electricity is unavailable.

Charge the supplied battery using the compatible charger and follow the battery manufacturer's safety instructions.

The PAC 400 is supplied with one rechargeable 18V 5.2Ah lithium-ion battery and one compatible charger.

The number of PCP airgun fills available from a single battery charge depends on the size of the reservoir, its starting pressure, the selected target pressure, ambient temperature and the condition of the battery.

Smaller top-up fills generally require less energy than filling a completely empty reservoir to its maximum approved pressure.

For this reason, there is no single number of fills that can be guaranteed for every PCP airgun.

Users who regularly refill several air rifles away from mains electricity may benefit from having a second compatible battery available.

Always allow the battery and charger to cool when necessary, avoid exposing them to moisture and follow the manufacturer's charging instructions.

The supplied charger is intended for charging the battery. The PAC 400 itself is designed to operate using its compatible battery power system.

The PAC 400 produces a maximum filling pressure of 300 bar (4,350 psi), making it suitable for many modern PCP air rifles and air pistols with compatible high-pressure reservoirs.

Umarex specifies a reference filling time of approximately 11 minutes and 30 seconds for a 0.2-litre reservoir at 190 bar.

The compressor is designed for compatible compressed-air reservoirs with a maximum capacity of 1 litre.

This makes it particularly suitable for individual PCP airguns and smaller reservoirs rather than large external compressed-air cylinders.

The PAC 400 prioritises portable battery-powered convenience over the fastest possible filling speed.

For users who require faster filling or regularly charge larger reservoirs, the PAC 1100 and PAC 1400 offer higher filling performance and support reservoirs up to 3 litres.

Actual filling times depend on reservoir size, starting pressure, target pressure, battery charge level and operating conditions.

Always follow the airgun or reservoir manufacturer's specified maximum filling pressure. Never exceed the reservoir's pressure rating.

The PAC 400 features an adjustable automatic shut-off system, allowing the desired filling pressure to be selected in precise 1-bar increments.

Once the selected pressure is reached, the compressor automatically stops the filling process.

The digital display provides a clear interface for selecting and monitoring the required filling pressure.

This is particularly useful for PCP owners who have several air rifles with different recommended filling pressures.

For example, an air rifle rated for a maximum filling pressure of 200 bar must not be filled to 300 bar simply because the compressor can reach that pressure.

Always check the correct target pressure before starting and monitor the compressor throughout operation.

The automatic shut-off system is a useful operating feature but does not replace the need for supervision or correct filling procedures.

The Umarex PAC 400 features an oil-free compressor design, eliminating the need for routine compressor oil changes.

It also operates without an external water-cooling tank or pump, reducing the equipment and preparation required for portable use.

An integrated overheat protection system helps protect the compressor if operating temperatures become excessive.

The compressor features a replaceable sponge air filter, which should be inspected and maintained in accordance with the manufacturer's instructions.

Keep the ventilation openings clean and unobstructed, and operate the compressor on a stable, dry surface with adequate airflow.

Oil-free and water-free operation does not guarantee that compressed air is entirely free from atmospheric moisture.

Regularly inspect the filling hose, seals, fittings, battery connections and charger for signs of wear or damage.

Never operate the compressor with damaged components or attempt unauthorised modifications.

The PAC 400 is designed for filling compatible pre-charged pneumatic airguns and approved compressed-air reservoirs within its specified pressure and capacity limits.

The supplied high-pressure filling hose uses a Foster connection, a common fitting type for PCP airgun charging equipment.

Adapters for 1/8", M10 and M10x1 connections are included.

Some PCP airguns use manufacturer-specific filling probes or other connection types, which may require an additional compatible adapter.

Before filling, confirm that the reservoir is suitable for high-pressure compressed air, that all connections are correctly fitted and that the selected pressure is within the reservoir manufacturer's limit.

The PAC 400 is designed for compatible reservoirs up to 1 litre in capacity. Do not use it to fill larger reservoirs beyond the manufacturer's specified limit.

Weighing approximately 6.1 kg, the PAC 400 is designed to be transported between suitable filling locations.

Its rechargeable battery power system makes it particularly useful for shooters who do not have access to mains electricity at the range or during outdoor practice.

Umarex rates the PAC 400 at approximately 80 dB during operation.

This makes it louder than the PAC ECO Silent, PAC 1100 and PAC 900 according to their published noise figures.

The PAC 400 is therefore best suited to users who prioritise cordless operation and portability rather than minimum noise.

Always use the compressor on a firm, stable surface with adequate ventilation and protect the battery and electrical components from moisture.

Always read the supplied Umarex operating instructions before using the PAC 400. The following is a general overview and does not replace the manufacturer's procedure.

• Charge the supplied 18V battery using the compatible charger.
• Position the compressor on a firm, level and dry surface with adequate ventilation.
• Inspect the filling hose, seals, battery and reservoir for damage.
• Fit the charged battery securely to the compressor.
• Connect the correct filling adapter securely to the compatible PCP reservoir.
• Set the required filling pressure according to the airgun or reservoir manufacturer's instructions.
• Start the filling process using the compressor controls.
• Monitor the pressure, temperature and operating condition throughout the fill.
• Allow the compressor to stop when the selected pressure is reached.
• Follow the manufacturer's pressure-release procedure before disconnecting the filling hose.
• Inspect and maintain the compressor and filling accessories as instructed.

Never leave the compressor operating unattended, disconnect a pressurised hose or exceed the pressure rating of the reservoir.

The standard manufacturer package includes:

• 1 × Umarex PAC 400 Performance Air Compressor
• 1 × 18V 5.2Ah lithium-ion rechargeable battery
• 1 × compatible battery charger
• High-pressure filling hose with Foster connection
• 1/8" filling adapter
• M10 filling adapter
• M10x1 filling adapter
• Spare sealing rings
• Replacement filter sponges
• Operating instructions

Optional adapters for other battery platforms, additional batteries, a PCP airgun and a separate compressed-air cylinder are not included.

The Umarex PAC 400 Performance Air Compressor is supplied with a 2-year (24-month) warranty covering manufacturing defects in materials and workmanship under normal use, subject to the applicable warranty terms.

Damage caused by misuse, incorrect operation, accidental damage, unauthorised modifications or failure to follow the manufacturer's maintenance instructions is not covered.

The supplied rechargeable battery and charger may be subject to separate warranty conditions.

If you experience a problem with your compressor during the warranty period, please contact Bamfords Online with your order details. We'll be happy to assist with your warranty claim.

Your statutory consumer rights remain unaffected.

What is the maximum pressure of the Umarex PAC 400?

The PAC 400 has a maximum filling pressure of 300 bar (4,350 psi).

Does the PAC 400 include a battery?

Yes. The standard package includes one rechargeable 18V 5.2Ah lithium-ion battery.

Does it include a battery charger?

Yes. One compatible battery charger is included in the standard package.

Can the PAC 400 operate without mains electricity?

Yes. The PAC 400 operates from its rechargeable battery, allowing it to be used away from mains electricity.

Is the PAC 400 compatible with Makita batteries?

The compressor uses a Makita-compatible battery mounting standard. Compatibility with individual battery models should be confirmed before use.

Can it use batteries from other brands?

Optional adapter sets are available for selected Black & Decker, Bosch, Einhell, Metabo and Parkside battery systems. These adapters are not included and compatibility should be checked before purchase.

How many PCP airgun fills can I get from one battery charge?

The number of fills depends on reservoir capacity, starting pressure, target pressure, battery condition and operating conditions. A fixed number of fills cannot be guaranteed for every airgun.

How quickly does the PAC 400 fill a PCP airgun?

Umarex specifies a reference filling time of approximately 11 minutes and 30 seconds for a 0.2-litre reservoir at 190 bar.

Can it fill a 300-bar PCP air rifle?

Yes, provided the air rifle's reservoir is specifically rated for filling to 300 bar and the correct compatible connection is used.

What is the maximum reservoir capacity?

The PAC 400 is designed for compatible compressed-air reservoirs up to 1 litre in capacity.

Does the PAC 400 stop automatically?

Yes. The compressor features adjustable automatic shut-off in 1-bar increments.

Does it require compressor oil?

No. The PAC 400 is designed for oil-free operation.

Does it require external water cooling?

No. An external water-cooling system is not required.

Does the PAC 400 have an air filter?

Yes. It features a replaceable sponge air filter.

Does it have overheat protection?

Yes. The PAC 400 includes integrated overheat protection.

How noisy is the PAC 400?

Umarex lists an operating noise level of approximately 80 dB.

What filling connections are included?

The compressor uses a Foster high-pressure connection and includes 1/8", M10 and M10x1 adapters.

How much does the compressor weigh?

Approximately 6.1 kg.

What warranty does the Umarex PAC 400 have?

The PAC 400 is supplied with a 2-year (24-month) warranty covering manufacturing defects under normal use, subject to the applicable warranty terms. The battery and charger may have separate warranty conditions.

What is the difference between the PAC 400 and PAC 900?

The PAC 400 is battery-powered and designed for portable filling away from mains electricity. The PAC 900 operates from a 230V mains supply and offers faster reference filling performance.

What is the difference between the PAC 400 and PAC 1400?

Both models offer rechargeable battery operation. The PAC 1400 provides faster filling performance, supports reservoirs up to 3 litres and can also operate from a 230V mains supply. The PAC 400 is smaller and lighter, making it more convenient for users who prioritise portability.

Which Umarex PAC compressor should I choose?

The PAC 400 is an excellent choice for battery-powered portable filling. Choose the PAC 900 for faster mains-powered operation, the PAC 1100 for mains and 12V vehicle power, the PAC 1400 for rapid filling with rechargeable battery flexibility or the PAC ECO Silent if reduced noise is your main priority.