"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, Adjustable Pressure PSI 750-3,000, Gauge Port in. 1/2, Flow GPM 25, 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"