Spanish to English Tech/Engineering Manufacturing Packaging

Hello everyone,

I'm translating a list of products for a plastic packaging manufacturer. All the items are containers for various food products and other powders such as talc. There is a type of lid/cap that I'm struggling with:

"Hay 3 modelos de tapas disponibles para utilizar con este envase: la referencia XXXX con un obturador giratorio..."

"Permite seleccionar distintas medidas y formas en los agujeros de salida para la dosificación del producto mediante una pieza giratoria llamada obturador que va montada a ella."

I believe that it's the kind of lid that you get for salt or the kind of parmesan that comes in a shaker, where you turn the top to reveal different sized openings. But a) I'm not 100% sure that it is this, and b) even if it is, I'm not sure what that's called in English.

Any guidance is appreciated!