Safety Screw will cut off pump operation when power drops or surges and also some component parts fail. For example, Diaphragm Rubber deteriorates or stretch, safety screws is broken or torn apart, then pump stops working. It is essential part which is equipped with HP 60 and above. Safety Screws is tiny stick shape in black color in the pump. Once, safety screws is broken, it must be replaced immediately to keep the pump ready to work again. Furthermore, air pressure affects safety screws. If volume air pressure overflow above a certain level or limited level, safety screws is broken or torn apart to secure the other component parts and even the pump itself from being damaged. Then, replace the safety screws with new one to keep the pump in ready condition to work again.