The Berkeley 4″ 70 Series Submersible Pump Liquid Ends with cast iron bowls and space age plastic impellers – these are also made with the StaRite label on them as well, same pump. It is one tough liquid end, made for the water wells being developed by the folks who drill wells and get water out of the ground for the unfortunate people of Africa and other under developed countries. It also handles the harsh sand and abrasives of the West Texas cotton producing region.