Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HVA254945 ITEM 5 found under Retainer Disk Valve by Automatic Switch Company. The National Stock Number assigned to this part is 4810013733343, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HVA254945 ITEM 5.