Preferred by technical divers who desire a more¬†voluminous breathing loop. ¬†These counter lungs have enough space for even the largest lunged divers. ¬†Even more important, is the inclusion of manual addition valves, which allow you to manually add DIL or O2 to your breathing loop. ¬†This is beneficial for technical divers who want more control over when and how much air is inserted into the loop.¬†
Kit Includes: Large Counter Lungs and Manual Addition Pack.