Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E93A found under Diaphragm Regulator by Matheson Co. The National Stock Number assigned to this part is 4820007621182, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E93A.