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

在点浇口形的模或无流道模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.

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