Whether you work in the HVAC industry, lab, or on the manufacturing floor, this is the pump for your applications. The lightweight design and rugged construction withstands even the most demanding environments. Dual-stage pumps feature two pump units connected in Series which are driven from the same shaft to create vacuum levels as low as 5 x 10?2 torri. Large-finned die-cast aluminum oil reservoir extends time between oil changes and helps limit overheating. All models have an isolation Valve to prevent oil suck-back into the system, angled low-profile oil drain for fast and complete oil changes, and large sight glass on oil reservoir to monitor oil level and condition. Center-balanced handle makes transportation easy and clean with no oil spills. Industrial belt drive models are built for industrial and laboratory applications. Both units have a larger than normal oil reservoir, ensuring extended pumping efficiency with few oil changes. These are available by calling an application specialist. Compact design is ideal for portable applications designed to minimize vibration. Dual voltage (except 07164-30, -32). isolation Valve and gas ballast protect pump and system.