This is a dog toy squeaker fitted into a pvc valve which allows it to be mounted internally on a pvc inflatable toy that has more than one air chamber. It works by mounting it over an existing baffle hole. The baffle is the separating piece between two chambers. For example, if a toy has ears, you could open up the toy, and glue the squeaker over the hole between the head and the ear. then when you squeeze the toy and air moves between the head and ear, it squeaks!
Here is a demo: https://youtube.com/shorts/Xwa89-QjxL0?feature=share
Base: 26mm
Outer Ring: 38mm
Height: 23.5mm
