if I get these caps and want to put together a blow off situation, what size food-grade tubing would I need to purchase for a tight seal?

The size that fits tightly on the cap? I would measure the nipple on the cap and buy tubing accordingly.

Will these caps hold a vacuum? Want to use it for degassing.

The fermenting lids I have are not the same as these. Mine would not hold a vacuum.

how do you syphon through the lid?

There are two holes in the lid one is for a air lock the other is for a racking cane or tube for siphoning. Both holes have caps to plug them.

Would this work for long term wine storage? (Decades)

I am not sure if this would work for decades. I have used it to condition beer after primary fermentation but for only 30 days. As long as you can keep oxygen out there shouldn’t be an issue. The major concern would be how tight the seal is with your carboy.

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🍷 Elevate your homebrew game with airtight, versatile caps that keep your craft fresh and your setup sleek!

AIRTIGHT SEAL WITHOUT CORKS - Twin caps double as stoppers, creating an oxygen-blocking seal that replaces traditional corks for fresher brews.
PREMIUM FOOD GRADE SILICONE - BPA-free, phthalate-free, and dishwasher safe for effortless cleaning and safe fermentation.
DUAL CONNECTION TUBES WITH SECURE CAPS - Each lid features two tubing ports with handy caps that snap into place, keeping your accessories organized and ready.
COMPLETE 4 PACK FOR SERIOUS HOMEBREWERS - Four lids and eight sealing caps ensure you’re fully equipped to ferment multiple batches or share the craft.
UNIVERSAL FIT FOR 3 5 6 GALLON GLASS JUGS - Stretchy silicone caps adapt seamlessly to multiple jug sizes, eliminating compatibility guesswork.

Fermentology Carboy Caps are premium silicone lids designed for 3, 5, and 6 gallon glass fermenting jugs. Each cap features two tubing ports with removable sealing caps, enabling airtight fermentation without corks. Made from food-safe, BPA-free silicone, these dishwasher-safe lids provide a universal fit and come in a convenient 4-pack, perfect for homebrewers crafting wine, beer, mead, kombucha, and more.

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