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Ablutions is a side quest in the Fallout 4 add-on Far Harbor.

Quick walkthrough

Far Harbor side quest: Ablutions
Speak to Mai.
Travel to the Vim! Pop factory.
Recover the pump regulator.
Return to Mai.
Negotiate a reward.
Reward: Radical Conversion
Reward: 150/250/350 caps
Radical Conversion
Install the regulator.
(INT 7+) Repair the decontamination system.
Test the decontamination system.
Reward: 350+ XP

Detailed walkthrough

For this quest, Sister Mai, at the Nucleus asks the Sole Survivor to acquire a pump regulator to repair the decontamination arches near the entrance. Her directions lead to the Vim! Pop factory which is inhabited by a large number of super mutants and their hounds. The regulator can be found in the Vim factory floor area with the two large mixing vats. Take the catwalk to the highest level and walk through the elevated office areas until reaching the eastern side of the room. The regulator is next to an ammo box on a desk.

Upon returning to Mai, questioning her about her "repairs" reveals that she is actually attempting to circumvent the decontamination arches' filter systems in order to have them irradiate instead of decontaminating everyone passing through. She then leaves the honor of installing the pump regulator to the Sole Survivor. Reaching the mechanism at the bottom of the submarine dock involves trudging through the dock's heavily irradiated water, so suitable preparation is recommended. With an Intelligence of 7 or higher, the Sole Survivor can opt to reverse Mai's alterations to the system before installing the new regulator, thus making the arches actually decontaminate as they were meant to do. Return to Mai to claim Radical Conversion, the unique radium rifle as reward regardless of how the quest was resolved.

Quest stages

Quest stages
StageStatusDescriptionLog Entry
10 Recover the Pump RegulatorSister Mai asked me to recover an industrial-strength pump regulator from the Vim! Pop factory. The place is apparently crawling with Super Mutants, so I'll need to be cautious.
20 Return the Regulator to Sister MaiI found the pump Sister Mai requested. Now to head back and claim my reward.
30 Install the RegulatorMai said I should be the one to do the honors of adding the final piece to decontamination system in the bottom of the bay. I suspect she just doesn't want to walk through all that... filth.
40Quest finishedTest the Decontamination SystemI repaired the decontamination arches in the Nucleus like Mai asked, but I also undid Mai's bypass to the decon system. Now to test that it worked. OR
I repaired the decontamination arches in the Nucleus. Now to test that the fix worked.

Companion reactions


If the quest was completed by reversing Sister Mai's alterations she will later thank the Sole Survivor for the work on the decontamination arches, commenting "... even if [it] does refuse to spit rads. Save folks from scouring, I guess."


PCPC Playstation 4Playstation 4 Xbox OneXbox One After completing the quest, then leaving and re-entering the Nucleus, the decontamination arches will only spray mist, and not affect the player's rads in any way, regardless of whether or not they chose to reverse the alterations.[verified]