Manual sample injection valve 21939-18 is designed for low-pressure chromatography systems. Easily introduce reproducible sample volumes using the included 0.5 mm, 1.0 mm, and 2.5 mm loops and 5-mL syringe.

Six-port loop injection valve 21940-24 has a "click-stop" mechanism for easy port identification. It is constructed from PTFE with a PEEK™ casing and PCTFE rotor and withstands pressures up to 500 psi (33 bar). Valve accepts 1/4"-28 UNF(M) fittings and features a 0.8 mm bore and M3 mounting holes. Use plug 21940-04 to seal any unused ports.