Introducing the Drip Depot Economy Air and Vacuum Relief Valve! Air Relief Valves are a vital component for water supply networks and irrigation systems. The primary function is to efficiently expel air while filling mainlines and to manage substantial air intake when the network is being drained.This Air and Vacuum Relief Valve boasts advanced aerodynamics and a kinetic orifice, providing defense against vacuum formation. Features:Maintains a secure seal even under low-pressure conditions.Safeguard your main irrigation networks with unrivaled air relief and vacuum prevention.Please Note: Air Relief valves can be installed at the ends of zones and along the line laterals. Regardless of where the Air Relief Valve is installed, it must be installed at the highest point in the system layout.