Have used this mouthpiece for the last 10 years. Its a good light weight option (so easy to travel with) to help address loop integrity in a number of difficult situations such as – long dives and jaw fatigue, high current situations and an alternative to a full face mask in managing an O2 hit. Its easy to remove if need be. It does not add to loop dead space. These mouthpieces are better than a simple strap as the flange prevents/limits water ingress when you relax your bite/mouth, which is needed after an O2 hit. The French navy published some data on these straps confirming good but not 100% efficacy in the unconscous diver. The advantage from my point of view over a full face mask is it allows for the mouth piece to be closed off and removed by just pulling the loop under your chin – stored where you can get to it again, whilst at the same time keeping your mask intact so you don’t l loose vision. Most people have a BOV but sometimes you may need to source OC gas from another source. In addition, the strap requires a less demanding skill set to use. PS it may not fit all makes of CCR.
Jeff Hughes –
Have used this mouthpiece for the last 10 years. Its a good light weight option (so easy to travel with) to help address loop integrity in a number of difficult situations such as – long dives and jaw fatigue, high current situations and an alternative to a full face mask in managing an O2 hit. Its easy to remove if need be. It does not add to loop dead space. These mouthpieces are better than a simple strap as the flange prevents/limits water ingress when you relax your bite/mouth, which is needed after an O2 hit. The French navy published some data on these straps confirming good but not 100% efficacy in the unconscous diver. The advantage from my point of view over a full face mask is it allows for the mouth piece to be closed off and removed by just pulling the loop under your chin – stored where you can get to it again, whilst at the same time keeping your mask intact so you don’t l loose vision. Most people have a BOV but sometimes you may need to source OC gas from another source. In addition, the strap requires a less demanding skill set to use. PS it may not fit all makes of CCR.