"The Brand Hydraulic In-Line Relief Valve is a ready-to-install adjustable ball spring-type relief valve that won't jam, lock or seize and always opens to help protect your hydraulic system from excess pressure. U.S.A. Max. PSI 3,000, Flow GPM 25, Gauge Port in. 1/2, Adjustable Pressure PSI 750-3,000, Port Size in. Various. Durable, dependable zinc-plated steel and aluminum body with chrome alloy steel ball Hardened alloy steel seat resists wear and tear Adjustable relief pressure from 750-3000 PSI Fast 25 GPM flow rate Ready-to-install design for quick and easy installation"