About this item The Rotary Vane Air Vacuum Pump is made of die-cast aluminum housing and a composite anti-slip rubber handle,lightweight and durable, for self diagnose or recharging AC systems The Air Vacuum Pump is with built-in high volume cooling fan for extended use; Oil sight glass design allows you to observe the oil level and quality easily; The oil drain valve at the vacuum pump bottom ensures faster and more thorough emptying; Manifold gauge set is designed specially to measure pressure in refrigeration equipment. Its large viewing glasses are easy viewing of refrigerant flow, and the colorful pressure gauges ensure accurate readings; 3 Pcs color-coded hoses help identify the high-pressure side (red), low-pressure side (blue), and the filling hose (yellow); they are used for maintaining R134a, R12, R22 and R502 air conditioning systems; NOT SUITABLE for R410a air conditioning systems HVAC A/C Refrigeration Kit includes single stage vacuum pump, vacuum pump oil, gauge set, additional adapters, R134a self-sealing can tap valve and carry bag