Makeshift Gas Mask

The makeshift gas mask is an unused piece of equipment in Fallout 3 which would have been used in Vault 106.

Gameplay
The makeshift gas mask is identical to the raider blastmaster helmet in appearance; it can also be repaired with it.

When worn, the makeshift gas mask prevents some (but not all) hallucinations from occurring while inside Vault 106. Wearing the makeshift gas mask will stop all hallucinations experienced when fighting the Survivor found in the lowest level of Vault 106, including the appearance of the hallucination versions of Butch DeLoria, Paul Hannon Jr. and Wally Mack.

Bugs
If the makeshift gas mask is worn and then removed, the blue tint which normally accompanies Vault 106 hallucinations will be permanently applied, even if the Lone Wanderer is outside Vault 106. The only way to remove the effect is through the use of console commands (either to clear the image space modifier directly or to remove the mask from the Lone Wanderer's inventory while worn) or by triggering a previously unseen hallucination inside Vault 106.