Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number METRON 3 4IN found under Meter Flow Rate Indicating by Elster Amco Water Llc. The National Stock Number assigned to this part is 6680014561543, 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 METRON 3 4IN.