Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS8BS1 found under Bellows Pressure by Nupro Co. The National Stock Number assigned to this part is 4820003758926, 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 SS8BS1.