Hollis DC1 500SE regulator is Old School -with New Tech! The new 500SE utilizes a servo controlled valve to provide precision airflow and unparalleled performance for both air and Trimix divers in a side exhaust configuration.
To achieve this- we have perfected the original "lever-servo valve" we designed 35 years ago. Overbalanced diaphragm first stage also provides ideal hose routing for both backmount and sidemount users and optimum performance regardless of depth.
Features and Specifications