18mm Neck

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Shop our 18mm bottle caps with tamper proof seals, perfect for using with 10ml, 50ml and 100ml glass boston bottles.

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18mm Black Tamper Evident Child Resistant Cap & Internal Dropper

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18mm Tamper Evident Cap + Drip - White - Bottles & Jar Accessories - Tamper Evident Cap + Drip
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18mm White Tamper Evident Cap & Drip – Bottles & Jar Accessories