This Lochinvar Pressure Relief Valve is designed with a 1-1/4 inch size and a set pressure of 125 pounds per square inch (psi). The valve is engineered to release excess pressure that builds up within a system, thereby preventing potential damage or failure. It is constructed with high-quality materials for durability and reliability, ensuring long-lasting performance. The valve's design allows for easy installation and maintenance, making it suitable for various applications in the plumbing and heating industry.