CHROME PLATED BRASS CYLINDER "POST" VALVE, MADE BY SHERWOOD VALVE IN THE USA. THIS VALVE HAS A .750-16 UNF-2A INLET THREAD AND A CGA 870 PIN INDEX OUTLET, WITH A 1/8"-27 NPT GAUGE PORT . THE PRESSURE RELIEF DEVICE IS A CG-4 AND IS SET AT 3360 PSI. THIS VALVE IS PRIMARILY USED IN ALUMINUM CYLINDERS IN THE MEDICAL AND HOMECARE HEALTH FIELDS. PLEASE DOWNLOAD OUR TECH SHEET FOR DETAILS REGARDING MATERIALS, REPLACEMENT PARTS, ETC.