Abstract: A water system uses a pressure tank of an extremely small size. Said pressure tank is of extremely small diameter and can be a variety of lengths. This pressure tank has an opening at one end for fluid inlet and an opening on the opposite end for fluid outlet. This pressure tank is placed inside the well casing or inside the fluid reservoir to protect it from freezing and vandals as well as hidden from landscaping efforts. The pressure tank utilizes a flexible diaphragm to separate the air chamber from the fluid chamber. Said diaphragm to be open at both ends and tube shaped to allow installation in a small diameter housing to be used inside small diameter well casing.