How do you tell which size you need?

I just looked at it on amazon and because I have two toilets with these fitted it just looked right. I did not know they came in sizes, I have changed one before, but got the whole unit just to get the flapper valve. I was pleased when I saw amazon did just the flapper valve and half price of whole unit. Sorry I cannot be any more help. It does say on the package that it is for 2" flapper units.

my old one is 2.5 inches across. Is this the same size please?

The one I have is slightly bigger at 2.75 inches across but that shouldn't be a problem.

My toilets very old, pull chain type. Would this be the right one to buy?

Agree with Fred’s comments. It would be a good modification to swap out the entire unit, but depending on the age of your high level cistern the whole down-pipe may also need changing as these were often lead jointed. Unless you are really good at plumbing, this is a job for a plumber.

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🚽 Save water, save money, flush smarter — upgrade your throne today!

BUILT TO LAST - Solid frame design with Microban antimicrobial protection resists corrosion, bacteria, and hard water damage.
CERTIFIED PERFORMANCE - CE, UL, and WaterSense certified for trusted quality and eco-friendly operation.
EFFORTLESS INSTALLATION - Simple, no-fuss setup means you’re saving water and money in minutes—no plumber needed.
PRECISION WATER CONTROL - Dial-adjust flapper lets you optimize flush volume for max efficiency and savings.
UNIVERSAL COMPATIBILITY - Fits most 2-inch flush valves, perfect for high-efficiency toilets from 1.28 to 3.5 gallons per flush.

The Fluidmaster F502P21 PerforMAX is a durable, adjustable toilet flapper designed to fit most 2-inch flush valves. Engineered for high-efficiency toilets using 1.28 to 3.5 gallons per flush, it features a corrosion-resistant Microban solid frame for long-lasting performance. Easy to install and WaterSense certified, it ensures optimal water savings without sacrificing flush power.

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Manufacturer	Fluidmaster
Part Number	502P21
Product Dimensions	12.45 x 8.89 x 8.89 cm; 45.36 g
Item model number	502P21
Size	1 Pack
Colour	Red
Style	Valve
Finish	Rubber
Material	Rubber
Pattern	Flapper
Item Package Quantity	1
Certification	CE, UL, WaterSense
Included Components	502P21 ADJUST-A-FLUSH TOILET FLAPPER
Batteries included?	No
Batteries Required?	No
Item Weight	45.4 g

Fluidmaster F502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, 1 Pack

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