DAYUAN Vacuum Purge Radiator Coolant Refill Kit — Aluminum Manifold & Dual-Scale Gauge, 32/35/40/45mm Adapters

Refilling a vehicle's cooling system can be slow and messy when air pockets form or when coolant spills during topping up. The DAYUAN vacuum purge kit uses shop air to evacuate the system, then draws pre-mixed coolant in under vacuum so fluids fill from the lowest point without trapping air. The kit includes a durable aluminum manifold, a dual-scale gauge, multiple radiator adapters, transparent hoses, and a protective case—everything needed to vacuum-test and refill most passenger and light-duty vehicle cooling systems.

How does the tool speed up cooling system refills?

The kit creates negative pressure inside the cooling system using shop air to pull coolant in quickly and evenly. With the system under vacuum, you open the valve and the pre-mixed coolant flows in until the system equalizes—usually cutting refill time to about 5–10 minutes depending on system size.

• Pneumatic vacuum uses shop air to evacuate air from the system.
• Vacuum gauge (-76 to 0 cmHg / -30 to 0 inHg) shows when to add coolant.
• Transparent 60" coolant hose and 23" splash-proof bleeder let you monitor flow.
• Typical refill completes in 5–10 minutes for most passenger vehicles.

Will this kit fit my radiator opening and most vehicles?

DAYUAN supplies a 32 mm O.D. rubber adapter plus three sleeve sizes (35 mm, 40 mm, 45 mm) so the tool seals common filler necks. Confirm your radiator opening diameter before use; the sleeves slide over the base adapter to match the cap size and form a tight seal for vacuum purging.

• Includes base adapter (32 mm O.D.) and sleeves for 35/40/45 mm openings.
• Replaces the radiator cap to maintain a sealed vacuum during filling.
• Not compatible with nonstandard or proprietary filler neck sizes—measure first.

What are the key components and how durable are they?

The refill tool features a premium aluminum manifold body with brass fittings for corrosion resistance, plus a 2" dual-scale gauge that reads in both cmHg and inHg. Hoses are transparent for visual control, and quick coupler fittings let you hook into shop air and coolant lines fast.

• Aluminum manifold and brass fittings resist corrosion and wear.
• 2" gauge indexed -76 to 0 cmHg (-30 to 0 inHg) for precise vacuum reading.
• Quick coupler attachments and choice of European/American air plugs included.

How do I use the kit safely and avoid common mistakes?

Always verify coolant type, system temperature, and radiator opening before starting. Use shop air to draw a vacuum until the gauge reaches an appropriate reading (typically -25 to -20 inHg), then open the valve to allow coolant in; monitor flow and top off per manufacturer specs once vacuum equalizes.

• Check coolant compatibility and vehicle service recommendations first.
• Do not attempt on hot engines—allow cooling system to reach safe service temperature.
• Watch the transparent hoses to confirm coolant flow and avoid overfilling.

Who is this for: The DAYUAN vacuum purge radiator refill kit is made for professional technicians, DIY mechanics, and fleet service shops that want faster, cleaner coolant changes and reliable vacuum leak testing. It suits most passenger cars and light trucks with standard filler neck sizes (32–45 mm when adapters are used), and is ideal when you need to reduce air entrapment, save cleanup time, and speed routine cooling system maintenance.