From 38999, I understand bayonet and tri-start. But can you simply describe what breech coupling is?
Breech lock connectors are widely used in outer space applications. Similar to a bayonet where there is a push and twist engagement. The breech lock allows the twisting action to pull the plug into the socket while locking. A Bayonet connector first uses more of a push then twist action while the breech lock uses the twisting of the breech ring to pull the connection together. In a weightless environment it is harder to push and seat bayonet connector than by just twisting. It makes it easier for the astronaut to maintain their orientation to the equipment without pushing themselves away. (Twisting force is easier to counter with the other hand countering the applied torque) With the optional wings, a Breech lock is easier to engage with a gloved hand than a threaded ring which requires multiple turns to seat and can be cross threaded.
