... 3) ISO9001:2000 4) Lifetime maintenance ZWL self-priming water pumpZWL has combined the self-priming function and associated mode ... without any other valve and can also absorb any wasted water with large solid particles, long fiber, and deposit, mineral ... move, install and maintain and runs smoothly., ZWL Self-priming water pumpCategorySelf-priming pumpWorking Air Humidity≤50°CMedium Temperature≤80°C ...