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Pony Bottle Gauge w/ Stem in PSIThis has a large face for easy underwater reading! Great for pony bottles, Inflation & Bailout cylinders 0-5000 psi Gauge is made from brass and the housing is nickle plating High impact polycarbonate lens Includes ONE Stem "spool" with the gauge! This gauge has a high pressure stem that you insert in the back of the gauge and into the high pressure. Use Tribolube 71 or the proper grease for your application on the o'rings to help slide the stem in.. YOU MUST USE THIS GAUGE WITH A STEM AND HP HOSE ONLY!! CAN NOT BE USED WITH FIRST STAGES!!