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"A pump that spews forth acid when thrust forward."
— In-game description
The Acid Pump (硫酸ポンプ) is a weapon featured in Rise of Nightmares.
A pair of bellows that were modified into a weapon carrying sulfuric acid in its' cavity instead of air, and with a tube through which the acid is forced out in a stream when the cavity is compressed. It carries 15 rounds.