3DCSP BRUSHLESS STAINLESS STEEL DEEP SOLAR WELL PUMPS:The 3-inch stainless steel impeller solar deep well pump (outer diameter 75mm). The impeller and runner are made of 304 stainless steel. Its main features are low power, low voltage, large water head, corrosion resistance, acid and alkali resistance and wear resistance. The pump requires fewer solar panels and batteries, which also reduces the installation cost of the pump.