T-H Marine Supplies SA-1-DP Scupper Adapter with Flapper, Black - Walmart.com
Drilax Flapper Adapter 5/8 UNC Thread with 1/4" Collet - Turns Angle Grinders Into Rotary Tools for Running Carbide Burrs and Flapper Wheels Made in USA Compatible with Dewalt, Makita, Bosch, Metabo -
Flapper Valve Ovalized Opening Garrett T3 5-Bolt Ford style adapter Swing valve | eBay
Flapper Adapter 5/8 UNC Thread with 1/4" Collet - Extra Long - Caswell Inc