If they are 90% chance this is made in china how can we know the plastic is bpa free?

Don't see that it matters. Nothing passes through the device into the carboy and positive to static neutral pressure inside prevents air from entering. Zero contact means no chance of transfer.

Can the airlock be removed from the bung and used with other standard bungs?

Yes, the twin bubble airlock can be removed from the bung.

what is the height of these from top to bottom?

aloha it is 7 inches.Try making "mead" it is amazingly good even with regular yeast! Add raisins

Will this fit my 5 gallon class jug?

Yes. The universal bungs that come with the twin bubble airlocks are designed for 3, 5 & 6 gallon glass carboys.

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Description

🍻 Brew Like a Pro, Monitor Like a Boss!

DUAL PACK EFFICIENCY - Two airlocks and bungs included for simultaneous fermentation projects
CRYSTAL CLEAR MONITORING - Transparent, food-grade plastic lets you track fermentation progress effortlessly
MULTI FERMENTATION MASTERY - Perfect for beer, wine, mead, kombucha, and even fermented foods like kimchi
EFFORTLESS PRESSURE CONTROL - Automatic CO2 release keeps your brew safe without manual intervention
UNIVERSAL FIT COMPATIBILITY - Rubber stoppers fit most carboys and jugs for versatile use

This pack includes two twin bubble airlocks and universal-fit carboy bungs made from durable, food-grade transparent plastic. Designed to release CO2 automatically while preventing oxygen contamination, these airlocks are ideal for managing fermentation in beer, wine, mead, kombucha, and fermented foods. Easy to use and compatible with most carboys, they ensure precise, hassle-free fermentation control.