Wisscool 4.5 CFM HVAC Vacuum Pump — 1/4 HP Compact Single-Stage with Oil Sight Glass

WISSCOOL's 4.5 CFM single-stage vacuum pump is a compact, 1/4 HP tool designed to evacuate moisture and air from small HVAC and automotive refrigeration systems before refrigerant charging.

This compact vacuum pump combines a 4.5 CFM displacement with a 1/4 HP (180 W) 110V motor to provide dependable evacuation for home HVAC work, vehicle A/C service, and light commercial refrigeration tasks. Built with an aluminum alloy housing, an oil sight glass, and dual port compatibility, it’s intended to speed up system evacuation while protecting components from moisture and impurities. The package includes 250 ml of vacuum oil so you can start service work immediately.

How quickly will this pump evacuate my A/C system?

The 4.5 CFM rating gives a good balance between portability and evacuation speed for small to medium systems. Evacuation times depend on system size, initial pressure, and leak tightness, but this pump reliably pulls deep vacuums needed for refrigerant service on automotive and many residential units.

• 4.5 cubic feet per minute displacement for efficient air and moisture removal.
• 1/4" SAE and 1/2" ACME ports for broad fitting compatibility.
• Includes sight glass to help monitor oil level during longer pulls.
• Built-in cooling fan maintains motor temperature under continuous use.

Which refrigerant systems and jobs is it compatible with?

This pump is engineered for automotive refrigeration and smaller-tonnage HVAC systems. It supports common refrigerants used in light service work and is suitable for tasks such as evacuating R134a lines, servicing R12 or R22 systems where appropriate, and preparing systems for recharge.

• Works with R134a, R12, R22, R502, and R410a on compatible systems.
• Useful for automotive A/C, domestic heat pumps, and small commercial refrigeration.
• Also suitable for vacuum tasks like resin degassing and wood stabilization.
• Dual-port configuration simplifies connection to manifold gauges and hoses.

What features help protect the pump and system during use?

Durability and contamination control are built into the design: an aluminum alloy casing helps shed heat and resist corrosion, while an intake filter keeps particulates and oil mist from recirculating. The sight-glass oil reservoir and scale let you check levels quickly, reducing the risk of running the pump dry.

• Aluminum alloy body for heat dissipation and longevity.
• Intake filter to reduce contaminants and oil mist carryover.
• Sight glass and oil scale for straightforward maintenance checks.
• Low-noise operation (~65 dB) and a non-slip base for stable work on benches.

How portable and user-friendly is the Wisscool pump?

The WISSCOOL pump was designed for technicians and DIYers who need a transportable, easy-to-handle tool. A nonslip handle and compact footprint make it simple to move between jobs, while the included oil and straightforward connections let you begin service without extra purchases.

• Lightweight size with a non-slip handle for easy transport.
• Approximately 65 dB noise level for less disruptive operation.
• Comes with 250 ml vacuum oil so you can start immediately.
• Stable non-slip base and built-in cooling fan for reliable field use.

Who is this for? The WISSCOOL 4.5 CFM single-stage pump is aimed at auto technicians, HVAC service professionals, and informed DIYers who maintain small refrigeration and air conditioning systems. It’s appropriate when you need a portable, mid-capacity pump for evacuating moisture and air before recharging refrigerant, and when you value straightforward controls, durable construction, and compatibility with common fittings and refrigerants. If you work on larger commercial systems requiring multi-stage deep vacuuming, consider a higher-capacity, multi-stage unit; for routine vehicle and home HVAC jobs, this pump provides a practical balance of power, portability, and value.