Piston Main Assembly 5600 SE or SXT, upflow 60102-62
( also used on some 6600, and 6700 valves that are upflow version ).
STAR ( S12CS32DR ) cross reference # 137913.
NOTE: This has white end cap top unique in designer ( not like white 60102-00, black, or gray, nor Green downflow ).
That is how you would know it is for the Up Flow electronic Fleck Valve ( 5600SE, 5600SXT, 6600, or 6700 Up Flow Versions ).
Please be aware that "downflow" is commonly used, and this "upflow" version is RARE.
If you are not sure, please send us photos of your part BEFORE placing order.