Hydraulic Cylinder

Hydraulic Cylinder is a treasure.

Source
Hydraulic Cylinders can be obtained as an enemy drop from the following creatures:
 * MA-X Patria - 97% chance

It can also be obtained as a collectible throughout the world:
 * North of Fort Vaullerey
 * Gralea

Quests
Hydraulic Cylinders are needed for the quest A Better Gravity Well to upgrade from a Gravity Well to a Gravity Well Plus.