The product low-temperature cooling circulating water vacuum pump model: DLSZ-I/II/III is a product developed by our factory, which is a combination of vacuum pump and low-temperature cooling pump. It can both vacuum up and provide low-temperature cooling circulating water, making it an excellent auxiliary equipment for vacuum distillation and vacuum concentration. It is particularly suitable for equipping with a rotary evaporator, which not only reduces the usage space but also lowers the vacuum degree, saving water resources. It is widely equipped in modern laboratories.