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-   -   Blow off tubing diameter (http://www.homebrewtalk.com/f39/blow-off-tubing-diameter-330927/)

Meatyboy 05-24-2012 08:46 PM

Blow off tubing diameter
Just a quick question. Been looking around trying to figure the standard diameter of a carboy bung so I know what OD blow off tubing I need to get. I'm assuming 3/8" but we all know what happens when we assume.

A-Juice 05-24-2012 09:09 PM

yes - and do you just stick it in there or do you seal it somehow?

jbaysurfer 05-24-2012 09:29 PM

What kind of bung are you using? The solid rubber ones you can fit a 3/8ths tube into, and yes, just make sure everythings wet with sanitizer and stick it right in there. I'll leave any teenage innuendo out this ;-)

If you have one of the universal ones like this:

get a 1/2" tube and slide it over the nipple in the middle.

Same deal, just push it on there. Both hoses will seal. There won't be a ton of pressure in your fermenter unless the blowoff tube gets clogged, which CAN happen in a solid bung and 3/8" tube in my experience, but the 1/2" tube on the universal bung has never steered me wrong.

Lastly, if you have a hood, you can use either size, just stick it on the nipple of the appropriate diameter.

kitchenbeer 05-24-2012 09:44 PM

I use 1" inside diameter tubing for my carboys

jbaysurfer 05-24-2012 09:50 PM


Originally Posted by kitchenbeer (Post 4114202)
I use 1" inside diameter tubing for my carboys

And just shove it into the neck right? This only works for glass carboys. I don't know what OP is using, but this is a good reminder to qualify that my advice above applies to better bottles/plastic carboys.

dbrewski 05-24-2012 09:53 PM


Originally Posted by kitchenbeer (Post 4114202)
I use 1" inside diameter tubing for my carboys

Yes I use this for my glass carboys. You never have to worry about overloading the tube. I have seen some serious flow coming out of the tube in vigorous top-fermenting yeast. Not sure how a tiny tube would handle that, probably OK for most beers though.

Meatyboy 05-24-2012 10:01 PM

I have a BetterBeer carboy. Plastic, obviously. Still learning my kit. Just got it in the mail today.

A-Juice 05-25-2012 03:18 AM

I measured my carboy . Looks like a 1.25" OD tube would fit for a fat blow off tube.

peter78 05-25-2012 04:11 AM

1 Attachment(s)
I use a 6.5 gal carboy and a 1" diameter blow off tube for the first week. It hasn't been necessary till my last batch-a hefeweizen-it went all the way through the tube to the other end dipped in star san.

amandabab 05-25-2012 04:43 AM

If you use a better bottle and want to go big with the blow-off tube.


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