What Is the Spike in the Cap of an Ointment Tube Called? – Single Word Requests

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I'm translating a text about an antifungal cream sold in aluminum tubes. The plastic cap of each tube has a spike in it used to break the foil/seal in the neck of the tube.

I'm not sure what these spikes are usually called. I googled but failed to find a description. It is spike or some other term?

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P.S. Original in Russian:

15 г крема в алюминиевой запечатанной тубе с белым полиэтиленовым колпачком, имеющим перфорационный пробойник.

Проколите запечатывающую мембрану при помощи острия на внешней стороне колпачка.

Best Answer

Spike, as you suggested, is a pretty clear term. Here is one source about eye ointment that uses this word:

Many tubes have a metal skin on the opening that must be pierced using the spike on the lid of the tube.

Here’s another source about Fucidine Ointment:

Then push the spike in the cap through the seal on the tube.

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