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

在点浇口的模具或无道模具中也用到另一道。

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

道拉料杆头部的凹槽成了一个有效的底切，可以用来拉出道或者是下进料设计中的二级道。