https://kolstrand.com/kolstrand-upper-flapper-valve-washer-for-tyee-1-pump-1-e/
AKPTDPP-1E Kolstrand Upper Flapper Valve Washer for Tyee #1 Pump - 1E
Kolstrand Tyee Pumps and Parts are available at Integrity Machining along with a complete line of equipment, parts and products by Kolstrand
upperflapper