Looking for a reliable pressure relief valve for your hydraulic, pneumatic, pumps, or plumbing system? Check out this brand new in box Watts 53L pressure relief valve with 1/2 inch threaded inlet and outlet diameter. This valve has a 150 psi capacity and can handle up to 15,000 BTU/HR. Made with high-quality bronze material, this valve is built to last. The model number is 53L and it was manufactured in the United States. This valve is a great addition to any system.