... with double-seal type, new material the use of hard wear-resistant materials, long-term operation in the oil chamber, the ... 3, pump the overall structure of small size, light weight, wear-resistant, energy saving, beautiful appearance, easy maintenance, no need to ... waste water, sewage.3, material corrosion resistance of this product:Three, WQP stainless steel submersible pumps sewage conditions of use1 ...