1. Air driven.
2. The pump can not over heating, and no harmful gas discharged.
3. No electric spark.
4. Bigger solids also can be passed and no block.
5. Do not damage solids.
6. Has suction ability.
7. Can empty running without risk.
8. Can works under water.
9. Widely usage, even for the viscous materials.
10. No complicated control system and easy to operate.
11. Compact design and lighter, easy to be moved.
12. Easy to maintain.