Toilet Flush Valves: Compatible With Toto Thu338N, 2-Inch Replacement Valve Kit ?UNIVERSAL DESIGN: Flush valve repair kit suitable for most 2-Inch one piece with top push buttom toilet. ?MEASURE TWO SIZE: This item is only applicable to 2.56"-2.95"(6.5cm-7.5cm)(about the size of a baseball) Toilet tank hole Diameter,and it cannot be used if it exceed this size.Measure the Tank Height: Height Should be 10"- 11.8" (25.4 cm-30 cm). Please measure the size including ceramic cover for water tank, otherwise , it won't fit. ?DUAL FLUSH WATER-SAVING TYPE: Dual flush water-saving type: for all drainage you can adjust water in the water tank; for half drainage, you can use the water in the water tank to adjust the silicone seal, it with good sealing effect, will not have leaking. ?QUICK AND EASY INSTALLATION: Our toilet drain valve is suitable for most one piece toilets.(not including flapper valve) easy to install in 10 minutes or less, and saves time and effort,get your toilet flushing like new again. ?NOTES: Please check the size in the main image before buying. Fit For TOTO THU338 flush valve,can works great with the old part THU338 and most 2 inch one pieces toilet.