SUITABLE FOR VARIOUS SYSTEMS - The VIVOHOME 4.5 CFM single-stage air vacuum pump is perfect for maintaining R134a, R12, R22, and R502 air conditioning systems; The machine is also suitable for R410a when equipped with 5/16-inch adapter; The inlet filter is equipped with two different sizes of port, the upper one is 1/2 ACME and the lower one is 1/4 SAE EASY & QIUET OPERATION - The inlet and exhaust fittings of the VIVOHOME air vacuum pump are easy to connect, so you can operate it easily; The low noise design avoids disturbing other people while using this air vacuum pump, and the working volume is less than 65dB; Pull up the cap and pour oil cleanly and easily; The visible oil window is convenient for you to monitor the oil level to add oil duly; The oil drain valve in the bottom helps empty oil completely POWERFUL PERFORMANCE - The VIVOHOME 4.5 CFM single-stage air vacuum pump is equipped with a 1/3 HP thermally protected motor and the ultimate vacuum is 5 Pa; The inlet filter can effectively prevent impurities from entering the pump chamber and the trap can effectively separate the oil mist from the exhaust gas; the powerful performance can meet for most situations DURABLE AND STURDY DESIGN - Die-cast aluminum housing, ergonomic grip handle, cold-rolled iron base, and four rubber bottoms ensure the air vacuum pump is robust and stable; Built-in high volume cooling fan and heat dissipation mash window can help extend the use time PERFECT FOR DIFFERENT NEEDS - The VIVOHOME vacuum pump is widely used for both commercial and household applications; Ideal for automotive air conditioning, HVAC work, refrigeration vacuum packaging, wine degassing, thermoforming and other applications with industrial requirements that need high vacuum pull from a compact pump vacuum pump 4.5cfm