The Chemiquip PLV 2550 Style 6 Set is a high-pressure limiting pressure valve designed for use in test equipment. With a 20 PSI limit and the ability to withstand up to 10000 PSI, this valve ensures precise and accurate pressure control for various testing applications. Manufactured by Chemiquip in the United States, this product is a reliable and durable accessory for measuring and inspecting equipment in industrial settings.