Yellow attachment to flapper in Cadet 3 toilet tank

The American Standard Cadet 3 flowise one piece toilet uses a flapper valve with a soft nylon washer to seal against the water outlet.
Over time this nylon washer develops 'puckers' causing water to seep between the nylon washer and the seat of the flapper. This seepage causes the water level in the tank to drop to a point where the water inlet valve opens to replace the lost water in the tank.
There are two ways to correct this problem:
1. Replace the soft nylon washer on the flapper, or
2. Replace the entire flapper valve.
Hope this solution helps.

It could be a bad seat around the flapper or the flapper itself. Replace flapper with one designed for the Cadet. Check water level and see it doesn't flow above the overflow tube. if it is above the tube lower the float ball by turning the screw at top of ball.

The flapper ball may be contaminated and not sealing or the float level has changed and needs adjustment. You should be able to see if the overflow has water flowing into it continuously.

What is getting caught unger the flapper?
If your referring the chain that pulls the flapper up when you engage the level, that can be easy fixed by shortening/removing the links from the chain.
You can also remove the flapper and clean the hard water residue so it can create a proper seal.
Once your finished you can perform a test to ensure no more water is making it through when the flapper is sealed.
Flush the toilet, watch for the flapper to close. Once closed drop a couple drops of blue food coloring into the tank and /sigh.... Wait to see if you see it coming out into the toilet bowl. Check back in a half an hour. If no blue... Good job.
Hope this helps.
J.Sper

This is diagram of a typical toilet tank setup if the refill tube is not putting water into the flush valve as pictured the toilet will do what you have described.

The float is always above the flapper.

No that flaw it is just not adjusted right. All that you need to do is adjust the chain so the float can not get under the flapper. To do this remove the hook from the flush handel. Once that is done adjust the chain by moving the hook down the chain a couple of links or un till you have about 2 links of slack.

Good Luck

adjust the float up to make water deeper....make sure no obstructions around the flapper....flapper needs to rest tight to bottom of inside the tank..flapper is the rubber peice that lifts when you push handle

the one in the center adjusts the shut off level the other one probably locks the ball rod on.If the drip is the tank draining into the bowl replace the flapper