Is "2 inches" the outer diameter of the flapper, or the size of the hole it fills?

Size of the hole it fits. They generally come in two sizes 2 in. and 3 in.

Is "2 inches" the outer diameter of the flapper, or the size of the hole it fills?

2" is the hole. The flapper is 3".

Will it stick to the ceramic material of the water tank, or just to plastic?

If you mean if it will seal (to prevent leaks) between fludhes, I think that either material will work if the material is smooth and free of any cracks or material. The water presdure in the tank will kerp it seal until it is flush. Or that is the idea. Good luck.

Material	Vinyl
Brand	Fluidmaster
Item dimensions L x W x H	4 x 7 x 7 inches
Exterior Finish	Vinyl
Inlet Connection Size	2 Inches
Inlet Connection Type	Barb
Outlet Connection Type	Barb
Number of Ports	2
Outlet Connection Size	2 Inches
Specification Met	WaterSense
Global Trade Identification Number	00039961000392
Manufacturer	Fluidmaster
UPC	039961000392
Part Number	555CRP8
Item Weight	4.8 ounces
Product Dimensions	4 x 7 x 7 inches
Item model number	555CRP8
Is Discontinued By Manufacturer	Yes
Size	2 In.
Color	Black
Item Package Quantity	1
Number of Handles	1
Included Components	Fluidmaster 555CRP8 5 Minute Flush Valve Repair Kit
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

Fluidmaster 555CRP8 Universal PerforMAX 5 Minute Toilet Flush Valve Repair Kit 2 In.

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