Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12-4 TRTXN-S found under Reducer Tube by Parker Hannifin Ltd. The National Stock Number assigned to this part is 4730015963761, 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 12-4 TRTXN-S.