A getter assembly is provided and includes a first canister, an internal can including getter, and a second canister. The internal can is disposable in the first canister to occupy a first position at which the getter is hermetically sealable and second positions at which the getter is exposed to an exterior environment. The second canister is engageable with the first canister to drive movements of the internal can between the first position and the second positions following activation and hermetic sealing of the getter.