Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 991-034 found under Handknob Control Kit by Sun Hydraulics Corp. The National Stock Number assigned to this part is 4820015772742, 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 991-034.