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A user installable upgrade
reducing the total weight of the mask and allowing greater hydrodynamics
Aerodynamic
Nitrox - Single gas up to 40%
Hollis Single Tank Adapter Bolt Kit Fourth Element Men's Long Sleeve Hydro-T A user installable upgradeDon't always want to dive doubles, but your gear is set up for doubles? The Hollis Single Tank Adapter gives you the versatility of single cylinder use when you have a dual cylinder set up. All you need is the adapter, and this set of stainless steel bolts with butterfly nuts which make installation and removal a breeze. Small parts can get misplaced or lost, so having a spare set of hardware can get you out of a bind in an emergency. Bolt kit comes
