(4) Novelty Cool Tubular Groaning Toy Noise Stick – YouTube

June 21, 2019

https://www.youtube.com/watch?v=GdNJfbPnlQ8

From Science Museum

“Listen as the plug slides inside the tube — The pitch will rise as the resonant column of air gets shorter and fall as it gets longer. ”

Groan Tube
https://www.amazon.com/Classic-Plastic-Groan-Noise-Making/dp/B0012GMS7Y/ref=sr_1_8?keywords=groan+tube&qid=1561162475&s=gateway&sr=8-8