NSV outlet
Relatively flat design on wall with sliding dust cover. You may confirm secure quick connection when you insert adapter as up and down release button comes out in front.
Outlet with key
To avoid using the outlet unintentionally, install the outlet inside the door and locked by key. It shall be recommended for psychiatric or pediatric ward.
CPS outlet
Turn the outlet valve and remove the adapter or dust cap cover. It has color coded handles for clear identification of each gases.