Will Flush Frog fit my toilet?
You can answer this question in about a minute without measuring the toilet or knowing its model number.
The 3-part fit test
Lift the tank lid. You are looking for three ordinary gravity-toilet parts:
- An accessible overflow pipe — usually an open vertical tube near the center of the tank.
- A fill valve — usually mounted to one side of the tank.
- A refill tube — the small flexible tube running from the fill valve toward the overflow pipe.
If you can clearly identify those three parts and there is room to clip a dispenser to the overflow pipe without touching the flapper, chain, float, or tank lid, you have the layout Flush Frog is designed around.
The fastest clue: where does the small tube point?
If a small tube from the fill valve is already clipped or aimed into the top of a vertical overflow pipe, that is the refill path Flush Frog uses.
Toilets that may not fit
Do not assume every toilet uses the same under-lid architecture. Common exceptions include:
- Pressure-assist toilets with a large sealed pressure vessel.
- Some compact one-piece toilets with very little clearance.
- Some dual-flush or tower-style systems with unusual overflow geometry.
- RV and specialty toilets that do not use a standard gravity-tank layout.
Brand name alone is not a reliable fit test. Two toilets from the same manufacturer can use very different tank hardware.
Clearance matters too
Even with an overflow pipe, the dispenser should not contact moving hardware. After clipping it on, the float must move freely, the flapper or flush valve must close fully, the chain must remain loose enough to operate normally, and the tank lid must sit flat.
Not sure?
Take a photo looking straight down into the open tank and use the contact form. If it does not fit after purchase, the 30-day guarantee covers no-fit cases.
If you want to know what each of these parts actually does, read Toilet tank anatomy.