DUMOS AC Vacuum Pump & R134a Manifold Gauge Set — 4 CFM Pump, Leak Detector, 330ml Oil Reservoir

The DUMOS AC Vacuum Pump with Leak Detector and R134a Manifold Gauge Set is an all-in-one HVAC and automotive refrigerant service kit designed to evacuate, test, and recharge air conditioning systems quickly and accurately.

This professional-grade kit combines a 4 CFM single-stage vacuum pump, an accurate high/low manifold gauge set, a leak detector, and a full complement of hoses and adapters in a padded carry bag. Built for technicians and experienced DIYers, the set supports common refrigerants such as R134a, R410A, R22, R12, and R404A, offering fast evacuation, visible oil management, and safe, reliable connections for a wide range of refrigeration tasks.

How fast and deep does the pump evacuate an AC system?

The pump uses a 1/3 HP motor and a rotary vane single-stage design to deliver 4 CFM free air displacement for efficient, rapid evacuation. It’s built to achieve deep vacuum levels needed before charging and to reduce moisture and contaminants within the system.

• 4 CFM free air displacement for quicker drawdown
• Single-stage rotary vane design for consistent vacuum
• Anti-slip base to minimize vibration during operation
• Thermal protection to prevent motor overheating

What features help with oil control and continuous use?

The pump includes a large 330 ml oil chamber with a clear sight window for easy monitoring and a bottom drain port for neat oil changes. A built-in cooling fan plus thermal protection lets you run the pump longer with reduced risk of overheating during demanding jobs.

• 330 ml oil reservoir with visible oil window
• Bottom drain port for clean oil replacement
• Cooling fan and thermal overload protection for extended operation
• Sturdy housing and anti-slip feet for stable use on job sites

How accurate and versatile is the manifold gauge set?

The aluminum manifold delivers reliable pressure readings via high and low gauges (0–140 psi and 0–400 psi) with clear viewing faces. Color-coded connections and included adapters make the set compatible with multiple refrigerants and system types, while quick couplers speed up swapping between service points.

• High/low gauges calibrated for common refrigerants including R134a
• Robust aluminum manifold body for durability
• Color-coded hoses rated to 4000 psi for secure connections
• Quick couplers and R410A adapters included for versatility

What leak detection and connection accessories are included?

The kit contains a handheld leak detector plus three 1.5 m color-coded hoses, assorted adapters, and a can tap to access service ports and refrigerant cans. Everything packs into a durable carry bag so you can transport the tools safely and keep components organized between jobs.

• Handheld leak detector for pinpointing refrigerant leaks
• Three 1.5 m hoses with high pressure rating up to 4000 psi
• Assorted service adapters and quick-connect fittings
• Durable zippered carry bag for easy storage and mobility

Who is this for? The DUMOS AC Vacuum Pump and manifold gauge set is intended for HVAC technicians, mobile refrigeration pros, and competent DIYers who need a compact, reliable service kit. It’s well suited for routine system evacuation, troubleshooting leaks, and recharging common refrigerants on residential and automotive systems—offering clear oil management, thermal protection, and a comprehensive set of service accessories in one portable package.