Hollis 500SE + DC7 Regulator, YokeThe 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. The regulator is designed to meet the strict CE standard for cold water performance, and its environmentally sealed first stage ensures the delicate internal parts remain protected from contaminants like salt, sand, and chlorine. The DC7 First Stage Regulator features a secondary