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1. The external thread is 7/8-14 teeth Unf left thread, and the internal thread is 1 inch-20 teeth fine thread.
2. Female throwaway cylinder thread x Soft Nose P.O.L. For personal use only.
3. Refills 1 lb. bottles in 1 minute or less so quick.
4. Works with all 20, 30, or 40 Pound 50,Cylinders.
