4" 100 mm Rubber Sprue Base Jewelry Lost Wax Casting Flask Ring Tree C Style

New  4" 100 mm Rubber Casting Sprue Base for Lost Wax Casting

Holds 5/16 - 3/8" Tree Tightly in place. Leak Proof.

Will fit Regular and Perforated Flasks

Great for Centrifugal casting and vacuum lost wax casting processes. 

Made from Natural Rubber