3-Inch Toilet Flush Valve Replacement 2-piece Toilet Tank Parts with Gasket and Bolts Fit for American Standard 738921-100.0070A Easy to Install High Performance Water-Saving - - Amazon.com
Fix for water leaking into toilet pan (push-button flush) - YouTube
Toilet Flush Valves 2-Inch Dual Flush Valve Replacement Kit for 2-Piece Toilet Tank Compatible with TOTO THU435 THU224 Flush Valve - - Amazon.com
LASCO 04-2353 Replacement Flush Valve for 1-Piece Toilets with Flapper and Chain, 3-Inch - - Amazon.com
TOTO THU451.10A-A N/A Replacement One Piece Toilet Flush Valve - FaucetDirect.com
Toilet Parts: What They Are and Common Fixes | Family Handyman