All flow passages in this 6-port injector are inert PEEK (polyether etherketone) or alumina-ceramic materials. They are unaffected by buffers, acids, bases, or halide salts, including 1 M sodium chloride, over the entire pH range. They valve is rated for pressure up to 5000 psi (350 kg/cm2), but the usable operating pressure may be lower, depending on the sample loop and solvents used.This injector is similar in function to the Model 7010 stainless steel injector, but is constructed of inert PEEK and Tefzel® materials for use from pH 0 to pH 14. It can be used for HPLC, soft gel chromatography, or ion chromatography.A position-sensing switch closes in the INJECT position and stays closed until the handle is returned to the LOAD position.