Features 1. 采用结实的铝合金外壳,不锈钢或塑料提手,使用轻便,功能全面。 Portability and versatility with a tough, aluminum cover and stainless steel or plastic handle. 2. 提供了一个洁净的真空环境,不会对系统产生污染。 Provide a clean vacuum and won’t contaminate your system. 3. 独特的皮膜设计减少磨损,延长工作寿命。 Unique flat diaphragm design reduces wear and tear for long service life. 4. 内设过热自动保护装置防止电机损坏,延长泵的寿命。 Built-in heat-triggered protector prevents motor damage and extends pump life.