Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EFI 37A 3 4 IN NPT 44 IN C TO C found under Indicator Sight Liquid by Ernst Flow Industries Inc. The National Stock Number assigned to this part is 6680012957412, 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 EFI 37A 3 4 IN NPT 44 IN C TO C.