Bare Bones Oxygen Whip w/ Digital Gauge This is the Bare Bones Oxygen Whip with Digital Gauge. From the Oxygen bottle we have a hand-tight nipple and nut (no wrench needed saves time). This then leads into a needle valve and a high pressure tee with digital gauge. From there we go a 4 foot Teflon cored, stainless steel whip. These have a working pressure of 3,000 psi and a blow pressure of 12,000 psi. To finish the whip off we have a din filler with screw bleed. Why do I need a Digital Gauge? Digital Gauge reasoning... Digital gauges are really necessary to do proper mixing of nitrox and trimix gases. The Gauges allow within a psi accuracy across the full range. If you mix with an analog gauge your accuracy rate falls to about 10 psi prior to filling and 10 psi after filling. This might not seem like a big deal until you analyze your mix. If you started with a nitrox or trimix mix half full and are topping off what happens is that you can be off by a large percent due to the inaccuracy of the gauge. With the price of digital gauges down to such a reasonable price of $199.99 it does not make sense not to go this route.