Immersible Breather Desiccators are designed to prevent pressure or vacuum build up in instruments or equipment specifically subjected to immersion in water. They are ideally suited to equipments or instruments subjected to temperature, altitude or barometric changes. The Immersible Breather Desiccators protects against distortion or other damage that would normally occur due to such changes, they have an additional desiccant cartridge which is designed to remove moisture from the moist air entering the equipment or instrument.