Divesoft BOV with Manual Addition Valves for CCR Liberty, KISS. Supplied together with two clamping rings and BOV extension knob. Dimensions of hose nipple circumference: 38.1 mm, 1 1/2″ .Dimension drawing is in “Files”. The bailout valve can immediately switch from rebreather to open circuit bailout in an emergency. There is no need to remove the mouthpiece from your mouth in such a dangerous situation as hypoxia, hyperoxia or hypercapnia. You make just one easy movement to switch to open circuit. Liberty BOV is really unique. It is a gamechanger on the market thanks to its functional design and features. Even though it combines a standard mouthpiece with second stage regulator, it stays light and compact. It is neutrally buoyant which prevents jaw’s fatigue during long dives. It is designed to be versatile, it is possible to connect it to the Divesoft patented MAVs or to implement a built-in ADV. Modular design allows you to choose between a standard mouthpiece or opt for a connector for a variety of full-face masks. In case your BOV is equipped with Single Hose Adapter, DO NOT use wrench to tighten it. Finger tight is enough in this case. SHA does not screw all the way in on the lower (2nd stage) thread, few screw threads will be always visible. Overtightening will cause the BOV and MAV to warp which leads to water/gas leaks and damage to the unit itself. More tutorial videos you can find on our YouTube channel.