Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EFI 54-A FLANGED 28" CTR TO CTR found under Indicator Sight Liquid by Ernst Flow Industries Inc. The National Stock Number assigned to this part is 6680015775418, 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 54-A FLANGED 28" CTR TO CTR.