Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HM043-038-11 found under Vent Block Assembly by Robertson Fuel Systemsllc. The National Stock Number assigned to this part is 4930015928353, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HM043-038-11.