Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4419.040 found under Trap Drain Plumbing Fixture by Thos Somerville Co. The National Stock Number assigned to this part is 4510010199108, 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 4419.040.