Manual disconnect for the propellant fill line of the Apollo Lunar Module's descent propulsion system, measuring 14.5″ long with a diameter of 2″ at the connector's cap, which is marked: "Coupling, Fuel Manual Disconnect, Fill-Vent Descent Propulsion…Contr No. NAS9-1100, The J. C. Carter Co." The main valve has an "Open/Close" rotating switch, and the line has a 10 micron filter unit at the opposite end. A tag wrapped around the center is marked by hand, "Hydro, 300 PSIG, 3-21-68." In fine condition. The Lunar Module's descent propulsion system used Aerozine 50 fuel and dinitrogen tetroxide oxidizer to provide a powered descent to the lunar surface.
Terms and abbreviations used in our descriptions.