The Hollis HO2 Bulletproof First Stage Regulator provides a dependable foundation for scuba diving gear and open-water setups. Built around the Hollis HP5 Non-Balanced Flow-By Piston First Stage, it is certified for up to 100% Oxygen Service thanks to specialized materials and manufacturing processes. Cleaned and prepared for oxygen service to support reliable performance in demanding diving environments.

Designed for durability in saltwater environments, the HO2 includes a DIN connection with an Oxygen Green hand-wheel for easy identification when operating with oxygen. The rugged marine-grade chrome-plated brass construction delivers corrosion resistance while maintaining a compact profile for dive gear tuning and maintenance.