What is the overall height?

Thank you for your inquiry. The airlock and stopper together are approximately 5 inches tall.

Will this fit a standard 32oz juice container at supermarket?

Thanks for asking. These stoppers will fit a 1-1/4in opening just right. Take a measurement and let us know if this isn't the right size for you. We'll be happy to find the right fit for you. Thanks!

Do I need to put water in the cup?

Yes. There is a fill line, fill it to that line. After some time some of the water evaporates so depending on how long you keep the airlocks on, you may need to add more water.

Does this fit a 3 gallon carboy

Yes, this fits most modern 3, 5, 6, and 6.5 carboys. A TIP: The #6.5 is almost too small and the #7 is way too big. If you put the 6.5 in and then the push in the airlock you can accidentally push the stopper into the carboy. INSTEAD, fit the airlock to the stopper (Making it a little larger) and then push the assembly into the carboy.

ASIN	B00IGXQ5I4
ASIN	B00IGXQ5I4
Best Sellers Rank	#24,459 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #7 in Brewing & Fermentation Airlocks
Brand	FastRack
Color	Clear
Customer Reviews	4.6 4.6 out of 5 stars (3,280)
Date First Available	February 15, 2014
Date First Available	February 15, 2014
Global Trade Identification Number	00852675727511
Is Discontinued By Manufacturer	No
Is Discontinued By Manufacturer	No
Is Dishwasher Safe	No
Item Weight	4.2 ounces
Item model number	Q3-MF2B-UE2A
Item model number	Q3-MF2B-UE2A
Manufacturer	FastRack
Manufacturer	FastRack
Material	Rubber
Number of Items	3
Product Dimensions	2"W x 6"H
Product Dimensions	4.09 x 8.07 x 1.77 inches; 4.23 ounces
Shape	cylinderical
UPC	852675727511 628504292877

Fastrack 3 Piece Airlock for Fermentation Hydrolocks for Fermenting Wine and Beer with Drilled Rubber Stopper Durable Carboy Bung with transparent Airlock Set used for Fermentation Set of 3

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