Cheap 5$ Blow-off Tube for a Better Bottle - Requires some advanced tools - Home Brew Forums

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Old 01-26-2013, 06:29 AM   #1
reverendnathan
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Jun 2011
Woodland Hills, CA
Posts: 48




You will need:
1 #10 Bung - this is your standard rubber bung that will fit a Better Bottle
1 3/4" ID - 1" OD Vynil tube cut to length - make sure your tube is 1" OD, as Home Depot has failed me in the past with OD measurements.

1 1" Spade Drill Bit, it looks like this
1 Impact Driver - make sure your spade bit is the correct fitting, usually 3/8"
1 Table Vise Clamp
1 Goggles
1 surgical mask
1 apron

This procedure should explain itself. You are using a wood spade to drill a hole 1" through your bung, which when drilled through will fit a 3/4" tube as a blowoff. It is absolutely necessary to use an impact driver as a conventional cordless drill will not facilitate enough torque to do the job.

Tighten the bung onto the vise, which will contort it's shape. Use your free hand to push the other sides to make the bung look more like how it would normally. Slowly impact drive through the bung; it will take 5-10 minutes.

This makes rubber ash fly everywhere - use protection and cover your mouth and wear an apron or slack clothes.

The hole made will not look pretty but it will be structurally sound and the tube will fit in with some effort.

This project will not save you any money over buying that whacky PVC blowoff kit seen online unless you already have these tools. And since you likely have the bung already, the 4' of tubing set me back just under 5$, just over 5$ if you want to start from a new bung (I used a predrilled bung just fine).

NOTE: I still would suggest an impact driver over a big plug-in drill or hammer drill as you need one free hand to hold the bung in shape, unless you want to use a large hand vise grip to hold it, but I think that would be putting down too much power... but it's worth a shot, I suppose.
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Old 01-26-2013, 02:52 PM   #2
Brewsday
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Mar 2011
Near Portland, ME
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Does anyone know if it's true that bungs drill easily if you freeze them with dry ice?
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Old 01-26-2013, 02:57 PM   #3
Markd27
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Apr 2011
Allen, Tx
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I made one the same way. If you're saying advanced tools are required, I'd recommend the use a drill press, which is how I did mine.

 
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Old 01-26-2013, 07:39 PM   #4
adamc
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Sep 2011
Lyons, Georgia
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I just use a bung, the bottom part of a 3 part airlock and tubing. No drilling or mods needed

No pic.

I can post one if someone wants.

 
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Old 01-28-2013, 07:53 PM   #5
bmick
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Apr 2011
New York, NY
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I recently picked up some tubing that fits OVER the pre-drilled hole in the BB bung (as opposed to in the hole, which restricts flow too much), and it works great. I want to say it's 3/4" ID.

 
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Old 01-28-2013, 08:44 PM   #6
nickmv
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Mar 2010
Memphis
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Any particular reason you didn't just use a carboy cap for < $5 and call it a day?
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Old 01-28-2013, 11:25 PM   #7
ishredthecello
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Jan 2012
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Quote:
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Any particular reason you didn't just use a carboy cap for < $5 and call it a day?
I used a orange carboy cap and 1/2" tube last night on a brew...and today, there was a mess in my ferement chamber...guess i'm gonna need something better I went with this set up as alot of people said it works...but that 1/2" tubing got clogged for me.

 
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Old 01-28-2013, 11:48 PM   #8
nickmv
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Mar 2010
Memphis
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It's funny you mention that. I actually am fermenting a DFH 90min IPA right now and the tube is getting a little clogged, as the bubbles come out in rapid succession all at once, then a long pause (presumably a buildup), and another release.

I've been brewing 3.5 yrs and have never had an issue though as far as it getting completely backed up. I'm debating washing this one out though.
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Old 01-28-2013, 11:56 PM   #9
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I used a hole saw and a regular drill. I held the bung in my hand, and drilled through with the hole saw. Worked like a champ. Obviously you want to not be an idiot and saw into your hand, but as long as your not a monkey or didn't eat too many paint chips in grade school, I'm sure you can figure out how to do it. The hole saw spreads pressure over 360 degrees of contact so deformation didn't happen, and if you can open a jar of pickles you can hold it still.

So, cliffs notes:
Hole saw.
Drill.
Hold bung.
Cut.

People who should not try this:
Forrest Gump
Grandmas and/or Grandpas
Delicate kittens
Zombies w/o hands
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Old 01-29-2013, 02:44 AM   #10
Markd27
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Apr 2011
Allen, Tx
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Quote:
Originally Posted by nickmv View Post
Any particular reason you didn't just use a carboy cap for < $5 and call it a day?
Carboy caps fit better bottles?

 
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