The Taco 400 HY-VENT Automatic Hot Water Air Vent is a high-quality relief valve suitable for both water and air applications. With a durable aluminum body and a maximum adjustable pressure of 150 psi, this valve is designed for reliability and efficiency. The 1/8 inch inlet diameter and 3/8 inch outlet diameter make it easy to install and use in various plumbing and hydraulic systems. Proudly made in Italy, this product is a trusted choice for businesses and industrial applications requiring precise control and venting of hot water and air.