Airlock Prefab

Cool!
IMHO, simpler option:

• two func_door (door1, door2): speed - 50, lip - 4, toggle;
• trigger_changetarget (door1) to change the target of func_button (airlock_button) to multimanager (a_but2);
• trigger_changetarget (door2) to change the target of func_button (airlock_button) to multimanager (a_but1);
• multimanager (a_but1): door1 - 0, door2 - 2;
• multimanager (a_but2): door1 - 2, door2 - 0;
• button (on right side, near info_player_start): target - door1;
• buttun (on the left side): target - door2;
• button in the middle (airlock_button), target - (empty).

@man_simple

Your setup works well for singleplayer but not for multiplayer. The button for door1 and door2 can be pressed by seperate players, which then opens both doors. Now that both are open and func_door can only TOGGLE, your airlock is broken forever. You would have to create a eleborate system of multisources to lock the buttons to prevent this. Even then, a player can block the door by crouching under it and the game would never know that the door is now not closed. Which again breaks the entire system.

Nice airlock! Can i use It in my map?

Sure! Feel free to use!