Valve

 is a relic material used in crafting.

Obtaining
can be found in Abandoned Ruins #2, Desert Abandoned Ruins, and the Somber Marsh Abandoned Ruins inside Parts Boxes or by themselves.

can also be found in chests in the Sewage Plant.

is commonly dropped by Chemical Dropout.

can also be obtained as a product of recycling Metal Jars.

Usage
is a crafting material.

Mission
Two s are needed to repair the pipe during the The Poisoned Water mission.

Worktable
is a required ingredient when crafting the following item:

Assembly Station
is a required ingredient when crafting the following items: