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"Sink Again" is our MEDIUM size and is made to fit tanks tanks measuring 16.8" - 20" (measured across the back of the tank with the lid off, but measuring 13" -17.5" across the front measured with the lid off). This is a great fit for most 1.28 GPF and 1.6 GPF toilet tanks and is compatible with most "universal valve" gravity flush toilets with flappers and fixed canisters, but it is not yet mechanically compatible with Kohler toilets which have a "jumping canister" flushing mechanism. For smaller than 15.5" - 16.8" tanks (measured with lid off) please purchase our SMALL size "Sink Twice". For large rectangle tanks of at least 18" x 8," (measured with lid off) please purchase our LARGE size "Sink Bigger". For larger than 19.5" tanks (measured with lid off), please purchase our Small size "Sink Twice" together with the expander sets sold separately which can expand that model up to 21". For improved fit, we recommend purchasing Loctite "sticky tack" which is excellent complimentary product for some SinkTwice customers who are seeking to affix the sinks tighter. Finally, we are now including small tubes in our parts packet. These are flow restrictors and can be inserted into the tee to either increase faucet flow or decrease faucet flow depending on whether the tubing is inserted into the tee on the upward pointing prong or lower pointing prong. We are always happy to help. Please reach out to us if you need any assistance with installation.