Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4P53507-102A found under Retainer Half Seal And Duct by Essner Manufacturing Lp. The National Stock Number assigned to this part is 1560001662468, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4P53507-102A.