A screw in priming valve for a Colt size flask with 10-1mm threads. The valve is used by removing the flask valve spring, locking the flask open and threading the priming valve into the spout hole. Use FFFFg black powder, for priming only. Best quality, made in the USA, this tiny valve dispenses three grains weight of priming powder, each time the nozzle is pressed into your rifle or musket's flash pan.
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