Water Reverser 

Something that people in the lower hemisphere attach to their toilets to make the water drain counterclockwise. Basically, it makes their toilets American.

Haha! Water Reversers are really becoming a trend in Brazil

Water Reverser by Turdmeister69 February 29, 2020

reverse water heater 

When you get done dusting off grandma and you decide to get it on you gotta first hose her off and let her dry on her heating pad

I wanted you borrow my grandmas garage so I had to do the reverse water heater to get the ok

reverse water heater by Cumdumpster1 September 25, 2023

reverse water hammer 

It’s like surge and swab...but different because it’s in reverse...

Kevin loves him some reverse water hammer!

reverse water hammer by Swagg00 January 4, 2018