Jabsco Discharge Flange

The 29091-1000 is a versatile component that fits many Jabsco toilet models, including:
Manual toilets:

29090-0000 and 29120-0000 series (up to 1997)
29090-2000 and 29120-2000 series (1998–2007)
29090-3000 and 29120-3000 series (2008 and onwards with "Twist 'n' Lock" handles)

Electric conversion kits:
29200 series (converts a manual toilet to electric)
Other models: Compatible with 29100, 29200, and 58XX0 toilet models, as well as the 58109-1000 part