Aspirin, also known as acetylsalicylic acid (ASA), is a salicylate medication, often used to treat pain, fever, and inflammation. Aspirin also has an antiplatelet effect by stopping the binding together of platelets and preventing a patch over damaged walls of blood vessels.
The device, which connects to the plumbing, regulates the home's water supply. When the water pressure drops to a certain level, the switch senses more water is needed, and spring-loaded electrical parts make contact, turning on the well pump. When the pressure returns to a preset level and the well tank is filled, the electrical contacts separate, and the well pump turns off.
1 Most pumps are typically matched to the recovery system of the well by the person who installed the pump in the first place.  Do not adjust the cutoff setting above 60 psi, unless the pressure switch supports a higher setting. Adjusting the pressure too high could cause water switch failure and pipe breakage.