【Dual-Stage High Vacuum Performance】2-stage direct-coupled structure delivers ultra-high ultimate vacuum, for deep vacuum applications and long-term stable operation. 【Oil Protection and Anti-Return System】Special gas ballast valve prevents oil-water mixing, built-in check valve stops oil backflow, no oil leakage/spray, extending pump oil service life. 【Low Noise and Compact Design】Low noise operation, small size and light weight, easy to start, for lab, workshop and on-site use without disturbance. 【Multi-Purpose Versatility】Can be used alone or as a backing pump for diffusion, suitable, degassing, freeze drying, vacuum packaging and more. 【Easy Maintenance】Fewer parts for easy maintenance, constant pressure oil circulation system, reliable performance for industrial and laboratory applications. Welcome and I wish you a happy life, my friend., Manufacturer: BGAZA