T-H Marine Flow-Max Ball Scupper - ClearFlow Max Ball Scupper Clear Replace your old worn out flapper scupper with our new Flow Max positive sealing ball scupper. A larger exit hole allows 70% more water drainage than its nearest competitor. Multiple mounting holes make retrofits quick and easy no filling holes or re drilling. A neutral buoyancy ball ensures the ball won't float up and break the seal. Meets all ABYC standards. The easy twist off design makes cleaning debris a snap. Simply