Lancaster Pump offers a broad selection of 4" submersible well pumps. They range in horsepower from 1/2 to 5 HP, with the most popular size range 1/2 to 1-1/2 HP, available in Corrosion Resistant Thermoplastic or Super Strength Stainless Steel. Capacity ratings are 5, 7, 10, 15 and 22 gallons per minute with heads as high as 990 feet.