Selectronic 3-in. Flush Valve Assembly with Flapper for 4019 Toilet Tank
Worldwide Sourcing 70994 Old American Standard Flush Valve - Walmart.com
AMERICAN STANDARD® replacement/repair parts for toilets and faucets
American Standard 4-in Black Plastic Flush Valve Repair Kit for Champion Toilet Models in the Commercial Toilet Flush Valves & Repair Parts department at Lowes.com
3" Pat Cover Toilet Flapper Replacement with Chain For Drain Valve Rubber Plug Old Style Toilet Tank Fittings| | - AliExpress