Guy M, For an equivalent to the 2586.128st.020 you would want to order 211AA.104.020. That is a right height, elongated, 1.28 gpf Champion. Sincerely, your American Standard Consumer Connection Team
Be thankful you have not purchased it. If you do research you will find that it has a manufacture flaw. It will not show up for 12 to 24 months but then it will develop a hairline crack in the tank. It will flood whatever area it is located in. Again this is a known manufacturing error. They will replace the toilet but will not pay for the damages you incur.
John, You will need to remove the black wing nut and lift off the green dome. Replace the blue seal. When putting the green dome back into place, be sure to line up the four slots on the bottom of it with the four slots on the bottom half of the flush valve that is still in the tank. Sincerely, your American Standard Consumer Connection Team
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Anonymous, Generally, the water spot is approximately 8 x 9. Make sure your water level is 1/2" below the overflow tube. Sincerely, your American Standard Consumer Connection Team
GG, The Max is for our Champion toilet and the tall height refers to the height of the bowl which is 16.5" from the finished floor to the top of the bowl. Sincerely, your American Standard Consumer Connection Team
You should be able to buy an oem and replace the supplied.
Ferguson carries a good selection. George Morlan is retail.
High Efficiency Toilet (HET) uses just 1.28 gallons per flush, or 20% less water than standard toilets which is 1.6 gallons. As to price, I don't know probably the technology factor.
Big enough for a toilet to fit.