Two similar experimental rocket thruster nozzles likely designed for satellite attitude thrusters, measuring 4.75″ long with diameter of 1″ at the top and 3.5″ across the bell, with pressure taps at the combustion chambers. One has the top collar cut off. These are made of a niobium alloy, prized in aerospace research and rocket engine design for its high melting point of 2468°C. No sale/export of this item to non-US citizens or entities.
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