ValveTool, Wrench with 5/16" Flat and 1/4" Opened Slit End. ARE-Applied Research brand. 1 EA.
The ValveTool™ is very popular because it is designed to reach onto your HPLC instrument's, Rheodyne™ or a Valco™ Injector while tubing is still attached to the Injector or for use on other valves with 1/4" connecting nuts .
Easy to tighten or loosen the 1/4" connecting nuts without twisting the tubing during wrenching. The opposite end of the ValveTool™ is a 5/16" flat wrench.