The Routed Firewall pipe connects with all other pipes from Project Red as well as with Chests and machines. If more than one Chest or machine are next to the pipe, only one of the chests or machines will be connected to the pipe (See above image).
Right-clicking on the pipe opens its GUI, which allows the player to configure the pipe. In the left field different objects can be placed. The button next to it can be toggled between "whitelisted" (only the designated items will pass through the gate) and "blacklisted" (all items except the designated ones will pass through the gate).
On the right side are four additional options: Push routing, Pulling, Crafting and Controller access. If the button is green, the action is allowed. If the sign is red, the action is not allowed.
These four options are explained below.
This option toggles between enabling or disabling item transport through this pipe for items behind the firewall. For example, if a new item is added to the pipe system and should be stored in a Chest, disabling item transport will prevent it from being stored if the Chest is behind the firewall.
This option toggles between enabling or disabling item transport through this pipe for Routed Request pipes. If item transport is disallowed, the inventory of all chests behind this firewall can not be requested by Routed Request pipes.
This option toggles between enabling or disabling item transport through this pipe for Routed Crafting pipes. If item transport is disallowed, Routed Crafting pipes before the firewall will be unable to pull items from chests behind the firewall. It is helpful if there are certain Chests that Routed Crafting Pipes should not access.