A gunge tank is a contraption used for dumping gunge on someone. Not often seen in the US, gunge tanks seem to have been more prominent on European television, most notably on Noel's House Party. The gunge tank from that show is now owned by Leon of Mostwam and used in many of their productions, such as Gunge Tank Girls and its more recent variation Mud Tank Girls (in which the tank is filled with mud).

The arrangement most commonly seen has a booth, in which the victim sits or stands, with a tank mounted atop it. The tank has an opening which is blocked by a plunger or other device, until a mechanism is activated (often pulling a chain) lifting the plunger and releasing the gunge.

The tank featured in Mostwam's videos has an optional insert which causes the gunge to fall in multiple small streams, something like a rain shower. Without the insert the gunge falls in one stream. While the insert typically ensures more even coverage of the victim, and lengthens the time it takes to empty the tank, some prefer the more forceful effect of the gunge falling in a single stream.

One variant of the gunge tank called a "flush tank" has been marketed in the US as an alternative to dunk tanks. In this version a balloon filled with water (usually), gunge, or confetti (for those who thrive on others' disappointment) is placed in a basket above the victim, and the mechanism triggers a needle to puncture the balloon.