Sprue Bases - Button Style

Choose from 8 sizes fitting the following flask diameters:

• 121.776 1-1/4
• 121.777 1-3/8
• 121.778 1-3/4
• 121.779 2"
• 121.781 2-1/2"
• 121.782 3"
• 121.783 3-1/2"
• 121.784 4"

These are button style sprue bases, with various sized center openings. Also called donut style sprue bases. The center opening range from approximately 3/8" for the smallest diameter button style sprue base and go up from there.