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.