Fluidmaster 502P21 PerforMAX Universal Water-Saving Long Life Toilet Flapper for 2-Inch Flush Valves, Adjustable Solid Frame Design, Easy Install, Red, (Pack of 2)

Why it's worth it

This is a 2-inch flapper with a rigid frame and a dial that sets how much water each flush releases. It comes two to a pack, so you can fix a second toilet or keep a spare in the cabinet for next time.

The 502P21 fits more toilets than anything else here. Most two-piece toilets built for 1.6 gallons per flush use a 2-inch flush valve, and this one clips or slides onto the standard ears on the overflow tube. Owners describe swapping it in under ten minutes without tools. If you don't know your toilet's model number and don't want to go looking for it, this is the safe first try.

The dial on the side is the part worth your attention. It controls how long the flapper stays open, which decides how much of the tank empties on each flush. Turn it down and you save water. Turn it up if the bowl needs more push to clear. A 1.28-gallon toilet and an old 1.6-gallon tank want different settings, and you can find yours in a few flushes.

From our review of 7 toilet flapper replacement kits, by David Sinclair, Managing Editor

What we like

• +The 502P21 fits more toilets than anything else here
• +The dial on the side is the part worth your attention
• +The solid frame is what separates it from a bargain flapper
• +You get two in a pack, which matters more than it sounds

What to know

• –Longevity is the open question
• –Chain length is on you, too