Halcyon Custom Doubles System pressure checker Easy-to-hold asymmetrical D shape functions

Easy-to-hold asymmetrical D shape functions like a classic D-shape without the weight

designed to keep that awkwardly shaped gear off the ground and to let it drain

Made from the highest quality silicone components

Screw on tip with 3 barbs

The new silicone reduces fogging effect

Halcyon Custom Doubles System pressure checker Easy-to-hold asymmetrical D shape functionsStandard Doubles BC System Built for the depths. Ready for what's next. Halcyon helped shape technical diving from the start, beginning with twin cylinders. As pioneers of the backmount systems, we redefined twin set diving with the Evolve: the first circular dual bladder system, built for perfect balance and trim. The Standard Doubles Cylinder System features the Evolve wing in your chosen lift capacity, with an upgrade option to the advanced Legend