lauter tun construction

yeasty · 06-23-2009, 11:11 AM

i noticed that my cooler i purchased for a lauter tun has an issue. when i removed the water plug at the bottom liquid can access the foam in the middle. where the hole is cut for drainage there is the exterior plastic layer and the interior with no sealant where the foam cavity is. i could permanently attach the copper drain i bought but it would be harder to clean...... i am worried if i leave it the way it is i will get wort into the foam and a nice bacteria growing. what have you guys done to combat this ???

**Bobby_M** · 06-23-2009, 02:01 PM

I think I need a picture. In all cases, whatever you use for a bulkhead has to seal to the inside wall so no water/wort ever gets into the foam core.

yeasty · 06-23-2009, 02:26 PM

not a member so i cant post a pic but i think you understand what i mean. the factory drilled hole is not sealed so that the foam wont get wet. i guess i will permanently attach the bulkhead fitting so liquid wont penetrate the foam and deal with cleaning the ball valve while installed.

Munsoned · 06-23-2009, 03:27 PM

Here's an example from Mr. Bobby M himself. I used this system. I've only done one batch in my MLT so far, but it seemed to be doing the job. I did an overnight leak test before using--no drips.

http://www.homebrewtalk.com/f11/no-leak-mlt-bulkhead-design-87197/

phatuna · 06-23-2009, 04:50 PM

what are you using for hardware? does it look something like this?
YouTube - Cheap and Easy Mash Tun

beerkrump · 06-23-2009, 04:50 PM

Most coolers have a rubber grommet that seals that inside hole. Did it come off with the spigot? If this is gone, the soft silicone o-ring idea presented above would work great.

yeasty · 06-23-2009, 05:29 PM

yeah its got the rubber grommet. i just noticed that it still allows liquid to get past the seal when you are cleaning, if its not tight enough, or you are sloppy.

Buffman · 06-23-2009, 05:36 PM

I use a neoprene washer inside mine. It gives a larger surface area contacting the MLT and is leak-free. Place it inside the tun against the cooler wall over the nipple, then a silicone O-ring, then a steel washer, then the collar. You can find the washer (called a "fender washer") at Home Depot in the specialty drawers in the nuts/bolts aisle.

Another thread on HBT discusses using a silicone nipple from a baby bottle, FWIW.

Munsoned · 06-23-2009, 07:05 PM

Careful with those fender washers. Any that are on the INSIDE of the tun should be stainless steel, not zinc plated (they should be so labeled). I had to get mine at Lowes (the Home Depot in my area doesn't carry SS ones).

Buffman · 06-23-2009, 07:27 PM

Quote:

Originally Posted by Munsoned

Careful with those fender washers. Any that are on the INSIDE of the tun should be stainless steel, not zinc plated (they should be so labeled). I had to get mine at Lowes (the Home Depot in my area doesn't carry SS ones).

Agreed. These "fender washers" are neoprene rubber, not metal. The washers holding everything snug (I have two on the inside to ensure a tight fit) are stainless, from bargainfittings.com.