Overview All grain brewing is the brewing of beer directly from malted grains and not using malt extracts. Many of the sugars, starches, and proteins in the malted grain grist are not readily available for yeast to metabolize. These sugars, starches, and proteins require an enzymatic process to convert them to fermentable sugars. The mash tun is the container used for mashing of the grain. A good mash tun will provide excellent control of the grain/liquor temperature, pH, and drainage when sparging. This article illustrates the step by step assembly of my 10 gallon mash tun.

Getting Started You need the following:

Qty. Description Image Cost
1 10 Gallon Rubbermaid Insulated Water Cooler
10 gallon cooler

10 gallon cooler

$34.99
1 Kewler Kitz™ Cooler Conversion Kit

Kewler Kitz Cooler Conversion

Kewler Kitz Cooler Conversion

$31.95
1 12″ Stainless Steel False Bottom w/ ½” NPT 3/8”barbed 90° elbow

False Bottom

False Bottom

$28.95
1 Mash Tun False Bottom Adapter

  • 1 – 1/2” NPT to 3/8” Barbed Fitting
  • 1 – 6” of 3/8” ID Tubing
  • 2 – 3/8” to 7/8” Stainless Steel Hose Clamps

False Bottom Adapter

False Bottom Adapter

$3.95
1 Teflon Tape

Teflon Tape

Teflon Tape

$0.00 (Already own it)
1 Channel Lock Pliers

Channel Lock Pliers

Channel Lock Pliers

$0.00 (Already own it)
1 Crescent Wrench

Crescent Wrench

Crescent Wrench

$0.00 (Already own it)
1 Common Screw Driver

Screw Driver

Screw Driver

$0.00 (Already own it)

Subtotal

$99.84

Assembly Steps:

1 Collect all of the parts necessary for the mash tun.

Remove the plastic spigot from the cooler.

Collect all of your Mash Tun Parts

Collect all of your Mash Tun Parts

2 Disassemble the Kewler Kitz Cooler Conversion Kit.

Insert the stainless steel nipple with washer and small red silicone gasket through the cooler’s spigot hole.
3 On the outside of the cooler, slide the larger red silicone gasket onto the stainless steel nipple.

4 Add teflon tape onto the threads of the stainless steel nipple.
Add the 7/8” threaded brass nut onto the teflon cloated stainless steel nipple. Hand tighten.

5 Using a crescent wrench tighten the brass nut while securing the stainless fitting in the cooler with channellock pliers.

6 Hand tighten the brass ball valve onto the teflon coated nipple.

7 Assemble the false bottom by inserting the threaded side of NPT 90 degree elbow through the false bottom hole and the tightening the brass nut.

8 Add teflon tape to the threads of the Mash Tun False Bottom Adapter and tighten onto the inside of the cooler. Connect the false bottom to the stainless steel coupling inside the cooler.

9 Slide the hose onto the barb on the false bottom and tighten the stainless steel hose clamps.

10 Fill with water and test for leaks. If leaks found, tighten fittings.

Kewler Kitz Assembly

Kewler Kitz Assembly

Summary:

Making your own mashtun is not that hard or expensive. When you are done you will have an excellent mashtun that will hold mash temperatures for a long time.