The SKR5-511-05 is an iron piston ring seal kit for Hydro-Line cylinders with a 2-1/2-inch bore. With its high-quality construction, this seal kit ensures a reliable and long-lasting seal. With its easy installation and precise fit, it helps maintain optimal cylinder performance and prevents fluid leaks. With its compatibility with Hydro-Line cylinders, this seal kit is an excellent choice for repair and maintenance.