A modified form of sprue gate is also used on underfeed moulds and runnerless moulds.

在点浇口形的或无流道也用到另一种形主流道。

The grooved head of the sprue puller creates an effective undercut which is used to pull the sprue, or secondary sprues in underfeed designs.

主流道拉部的凹槽形成了一个有效的底切，可以用来拉出主流道或者是下进设计的二级主流道。