Acid Soaker
This is yet another unique weapon that is found in Nuka-Town, USA. Head on over to the Nuka-Cade where you can earn a bunch of tickets by playing arcade games. Once you’ve earned a hefty sum (about 6,500 tickets) head on over to the redemption terminal and check the prizes. You should find the Acid Soaker in one of the five levels of prizes. If not, wait in order to pass time and check again. The rewards change periodically, but you’ll eventually be able to purchase this weapon.
It may look like a pipe pistol, but it actually shoots little spurts of acid, making it more like a water-gun than anything else. It doesn’t do much damage (it’s base is 10 Acidic damage), but it does deal damage over time and can temporarily lower a target’s damage resistance. With that in mind, this weapon best serves as part of a combo. Spray your enemy with a bit of acid, then switch to something like the Splattercannon to light them up.