Original Gerber 3 inch Toilet Flapper for multiple Standard Single Flush Gerber Toilets - See Model Information Below Soft clear flapper - includes stainless steel chain and hook Used for several variants of the Gerber Maxwell, Brianne, Logan, Avalanche, and Picturesque 1.6gpf (flush volume) Toilets. Tank Models include 20-900, 20-902, 20-904, 20-910, 20-912, 21-018, 21-011, 28-180, 28-183, 28-530, 28-535,28-980, 28-990, 28-992, 28-994, 28-995, 28-970. Will also work in tank models 28-890/2/5 if original flapper was a clear flapper. NOTE that not all model variants of the 28-890/2/5 used the same flapper. Flush Volume can be found by looking on the toilet behind the toilet seat. Tank model and other parts information will be printed inside of the ceramic tank. Note that this flapper is NOT compatible with a similar Gerber flapper GA715014-GEG1. SEE PICTURE FOR COMPARISON.