This Wilton twist quick coupler is simple to use and makes changing piping tips a lot easier. It works well with small nozzles. Big nozzles like the Wilton 1M nozzle and the Wilton 2D nozzles require a different coupler.
I have done a video showing the best coupler for bigger piping tips.
Wilton twist quick coupler :https://amzn.to/3ju9Zfu (affiliate)