Trap way and 4 in. The american standard champion 4 max 2586 128st 020 is part of the toilet test program. With a larger trapway and flush valve the champion 4 is able to move a 70 larger.
American Standard Champion 4 Max Tall Height 2 Piece Het 1 28 Gpf Single Flush Elongated Toilet In White With Slow Close Seat 2586 128st 020 American Standard Flush Valves Flush
Pin By Connie Wert On Todd S Shed Flush 10 Things American Standard