Here's the TridentTM Mash System. Although I was happy with the EasyMasherTM in my 8-gallon enamel kettle, I felt that I should get better efficiency with multiple screens considering the larger cross-sectional area of the 18.75-gallon kettle. There is a slight downward bend on all three prongs of the Trident, which places the screens in contact with the bottom of the kettle. This minimizes the amount of wort that is left behind after draining.
The brass fittings are 3/8" compression to 3/8" male NPT. The tubing is 3/8" OD soft copper. The 3/8" ball valve, brass fittings, copper tubing, hose clamps, teflon tape, and stainless steel washers (believe it or not!) were purchased at Ace Hardware. The SureScreensTM at the ends of the copper are available at many homebrew supply shops or from Sheaf & Vine. I bought the stainless steel 3/8" NPT cross and 3/8" close nipple from McMaster-Carr.
A slightly closer photo shows the assembly after the teflon tape has been wrapped on the fittings and the fittings have been tightened for a final fit. The hose clamps may seem optional because the screens fit rather snugly on the copper tubes, but you want to make sure the screens con't pop-off during stirring. The outer two prongs of the assembly don't go all the way to the walls of the mash tun. If they did, this would increase the likelyhood that sparge water would channel down the smooth walls of the mashtun and bypass all the sugars trapped in the grain bed. Make sure the compression fittings are tight: I made one batch where I accidentally swiveled one of the prongs upwards into the mash. The result was that as soon as the level of the wort dropped below the top of the highest prong, air could be drawn into the wort if the runoff rate is too high. Furthermore, it increases the likelyhood that some sugars will be left in the stagnant part of the grain bed below the swiveled prong.
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