O-ring and connector for cooling

The size for O-ring and their slot:

Diameter 6mm & 8mm water line

Diameter 10mm & 12mm water line

Diameter 16mm & 20mm water line

The stopper and connector for cooling

The distance between the O-ring and the side wall of the mold core should be greater than core chamfer + 2MM, so as to prevent water leakage.