... alloy seal and longer life;5. The use of special structural design, displacement is much larger than similar products;(Example: 50mm diameter ... , head 20m, a displacement of 550 ~ 600L / min)6. Portable design (machine 19kg), can be placed anywhere to use, and the ... use of water cooling and sealing Fangzao design, almost no noise, quiet environment. self-priming pump