The Valve + Ferrule & Nut for Pressure Switch is a set of components used to connect and secure a pressure switch in a system. The valve controls the flow of fluid or gas, regulating the pressure in the system. The ferrule is a small, typically ring-shaped fitting that ensures a tight seal and prevents leaks when the valve is connected to the pressure switch. The nut is used to secure the ferrule and valve in place, ensuring everything is properly fastened and sealed. This set is essential for maintaining the integrity and functionality of the pressure switch, often found in applications like HVAC systems, water pumps, or industrial machinery.