This pump is an improved version based on the multi-purpose circulating water vacuum pump. Designed to accommodate the limited space in laboratories, it features a one-time molded shell and a more compact structure. It is characterized by its small size, light weight, and aesthetically pleasing appearance. The dual-gauge, dual-head pumping system, as well as the four-gauge, four-head version, offers a multi-purpose vacuum pump with identical dual-sided operation. This allows teachers to demonstrate with ease, while students can start or stop the pump from either side. (1) The unit is equipped with dual extraction heads, which can be used individually or in parallel, and includes two vacuum gauges. (2) The newly improved anti-corrosion four-head model can be used individually or in parallel and comes with four vacuum gauges. (3) The main unit is available in two models: one with a stainless steel mechanism and another with an anti-corrosion material mechanism. (4) It is corrosion-resistant, pollution-free, low-noise, and easy to move. A vacuum regulating valve can also be added upon user request. (5) It allows up to four students to conduct chemical experiments simultaneously, saving experimental space. Technical Parameters: Model Matching Performance Unit Function External Dimensions (L×W×H mm) Total Weight (kg) Power (W) Operating Power Supply (V/Hz) Flow Rate (L/min) Head (M) Body Material Maximum Vacuum (Mpa) Single Head Pumping Capacity (L/min) Number of Pumping Heads Water Tank Capacity (L) SHB-Ⅲ (3) 180 ～220/50 60 8 Anti-corrosion 0.098 10 2 15 400×280×420 15 SHZ-D(Ⅲ) 180 ～220/50 60 8 Anti-corrosion 0.098 10 2 15 400×280×420 15 SHZ-D(Ⅲ) Four-Gauge Four-Head 370 ～220/50 60 10 Anti-corrosion 0.098 10 4 15 400×280×420 15 SHB-3A Four-Gauge Four-Head 370 ～220/50 80 10 1Cr18 & Anti-corrosion 0.098 10 4 18 380×280×420 15