Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS43S4 found under Valve Ball by Swagelok Ltd. The National Stock Number assigned to this part is 4820005424692, 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 SS43S4.