IPA: /dɪˈvɜːrtər/
KK: /dɪˈvɜrtər/
A device or person that changes the direction of something, often used to redirect fluid in pipes or to change a course of action.
The plumber installed a diverter to control the water flow in the shower.
Diverter → It is formed from "divert" (from Latin "divertere", meaning to turn aside) and "-er" (meaning a person who). A diverter is a person or thing that turns something aside or changes its course.
Think of someone who 'turns aside' ('divert') something — that's what a diverter does.