DAYUAN Cooling System Vacuum Purge Radiator Coolant Refill Tool Kit — 4-Adapter Set with Dual-Scale Gauge

This compact kit uses shop air to create a vacuum in the cooling system, eliminating the need for manual bleeding and reducing the chance of trapped air pockets. Built around an aluminum manifold, brass fittings and a dual-scale vacuum gauge, the tool connects to the radiator neck with one of four adapter sizes and pulls coolant into the system through a clear hose for visual monitoring. It shortens refill time, simplifies cleanup, and is designed to work across most passenger vehicles.

How does the vacuum purge process speed up coolant refills?

The tool first seals the radiator opening with a chosen adapter, then uses shop air and the manifold’s fittings to pull a vacuum through the filler hose. Once the target vacuum is reached, opening the valve lets premixed coolant flow into the depressurized cooling system, filling without large air pockets.

• Pneumatic vacuum pulls air out before adding coolant to prevent trapped pockets.
• 0–76 cmHg (0–30 inHg) gauge shows vacuum level for precise timing.
• Vacuum fill typically completes in 5–10 minutes depending on coolant volume.
• Clear coolant hose allows visible flow and leak detection while filling.

What vehicle openings and hookups does this kit support?

The refill kit includes a fixed O.D. 32 mm rubber adapter and three interchangeable adapter sleeves sized 35 mm, 40 mm and 45 mm to fit most radiator necks and coolant reservoirs. It also supplies two accessory air plugs—European and American styles—and quick couplers to connect to a standard shop air source for vacuum generation and leak testing.

• Adapters: 32 mm base plus sleeves for 35, 40, 45 mm openings.
• Air compatibility: European and American-style air plugs included.
• Quick couplers ease connection to shop compressors for vacuum operation.
• Brass fittings and aluminum manifold resist corrosion for workshop durability.

How do I read and use the vacuum gauge safely during refill?

The dual-scale gauge reads in cmHg and inHg and indicates the vacuum pulled inside the cooling system. Typical filling is recommended when the gauge registers around -25 to -20 inHg (approximately -63 to -51 cmHg), but users should consult vehicle service guidance for exact specifications.

• Gauge range: 0 to -76 cmHg (0 to -30 inHg) for clear monitoring.
• Recommended fill zone: usually near -25 to -20 inHg for many systems.
• Transparent hoses let you confirm coolant movement as valve opens.
• Case protects the gauge and components between uses to prevent damage.

What accessories are included and how do they improve workflow?

The kit ships in a molded case and contains a 60" coolant filling hose, a 23" splash-proof bleeder hose, brass fittings, adapter sleeves, two air plugs, quick couplers, and the aluminum manifold with attached gauge. These components are selected to minimize tool changes and reduce cleanup time during routine service.

• 60" clear coolant hose for unobstructed flow monitoring and reach.
• 23" splash-proof bleeder hose for controlled venting without spills.
• Molded storage case protects the gauge and organizes parts for quick use.
• Durable materials (aluminum body, brass fittings) extend tool life in workshops.

Who is this for: The DAYUAN Vacuum Purge Radiator Coolant Refill Kit is built for professional mechanics, home DIYers who perform routine cooling system service, and fleet technicians who want faster, cleaner coolant changes. It’s especially helpful where repeatable, air-free fills and leak testing are important to avoid overheating risks caused by trapped air and to save time on every service interval.