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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > Plastic Keg to MLT conversion - need suggestions
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Old 04-30-2012, 07:43 PM   #1
LoneWolfPR
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Default Plastic Keg to MLT conversion - need suggestions

So I managed to get a plastic keg because it has a huge crack in the bottom. I'd like to convert it to an MLT. The crack isn't an issue because it's the part of the bottom I'd just cut out for an opening. The problem I have is that the opening at the top isn't the same size as a standard keg. The inside of the opening is the standard 2'', but the outside of the plastic is 2.5''. It also doesn't look like a tri clover clamp will work on it. I'm looking for any suggestions people might have of being able to hook up some sort of elbow to a ball-valve coming from the opening. Here are some pictures.


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Old 04-30-2012, 07:52 PM   #2
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Any chance of getting a cheap/free coupler from the same place you got the keg? If so you could probably modify for your use.


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Old 04-30-2012, 07:58 PM   #3
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doubtful, but possibly. I'd need a stem assembly too though. Would I be able to take it apart, removing just the stem so that the coupler can still attach, but I can drain straight from the bottom?
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Old 04-30-2012, 09:16 PM   #4
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I would imagine you could adapt the coupler but honestly without seeing it hard to say for sure. If you can get a look at one you could probably decide. I especially wouldn't pay for one before I knew it could be modified.


As long as you have a false bottom installed I can't think of a reason why you wouldn't be able to drain directly below it, there would be no loss of wort from mash/lauter tun dead space!
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Old 04-30-2012, 09:21 PM   #5
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you could cut the bottom as planned, then get a tap and die set large enough to put threads inside your top opening. thread on a ball valve or whatever you plan to use. Insert false bottom and away you go :-)
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Old 04-30-2012, 09:33 PM   #6
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Well the top opening already has threads for the spear assembly. I think I'm going to see if they have an extra spear assembly. Looks like I could remove the spear itself leaving the top portion. Then I could just plug up the gas port on a standard sankey coupler.

The other option that's been mentioned to me is looking for some sort of rubber boot that I could hose clamp to the opening and an elbow then hook the valve to the elbow.
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Old 04-30-2012, 09:41 PM   #7
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if it is already threaded, then get a nipple and a reducer and attach a valve. Or get a 2" plug and install. then pop a hole in the side if that is what you want to do.
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Old 04-30-2012, 09:49 PM   #8
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oops, my mistake. I misunderstood how these things work. I guess it's not threaded.
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Old 04-30-2012, 11:27 PM   #9
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With a little creativity and a few basic plumbing parts you can create a drain without the use of a tri-clamp.

http://www.homebrewtalk.com/f51/star...-herms-192608/
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Old 05-01-2012, 02:03 AM   #10
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How did you create a seal between the copper pipe and the side? Some sort of epoxy?


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