Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 89HM10974-1 found under Seat Valve by D F P Manufacturing Corp. The National Stock Number assigned to this part is 4820007007238, 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 89HM10974-1.