Thank you for choosing Aerospace-Aviation360 for Part Number 4753880 described as Line Checker, Fuel Flow System. Isolates Malfunctioning Components. For Use With Ge 12000 Pph Indicators. Replaced By 4753880-503 Rev D. by Mcdonnell Douglas. This is an ASAP Semiconductor owned and operated website. We are a leading supplier of aircraft tooling parts. You have 24/7 x 365 access to our diverse product database with the fastest lead times in the industry.