Description 1/8 NPT Threading - Fits nearly all regulators on the market today Low Profile. Definitely an awesome option for tanks that change positions. Removes with 5/32 Allen Wrench. REVIEWS (No reviews yet) Write a Review Write a Review × First Strike First Strike PRO Fill Nipple Rating Required Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email Required Review Subject Required Comments Required