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Aliexpress
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15mm diameter wide bore drip tip, Diameter: 24mm, Capacity: 4ml, Material: 304 stainless steel and glass, Thread: 510
Price history and price alert
Here is price history (for all/most countries) for OBS Crius II RTA Black.
Price records source(s): Gearbest
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You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).