Rocket Engine, Liquid, Apollo Service Module Reaction Control System, Mockup

Cone-shaped, yellow-green anodized nozzle, smooth, without ridges as in standard RCS motor; short combustion chamber mounted on top. Injector head on top of combustion chamber, with oxidizer valve, a short shaft, attached to its top; fuel valve, mockup, mounted at angle to oxidizer valve, also a mockup. Two twisted, thin wire bundles leading from bottoms of fuel and propellant valves. Individual wire strands in each bundle, black, white, green, blue, yellow, and red, each bundle wrapped in yellow-green fabric which differs from usual transparent insulation for standard RCS motors. Flange bolt circle on injector head. The word "Mockup" engraved on support ring and also appearing on each of the two propellant valves.