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

在点浇的模具或无流道模具中也用到另种主流道。

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

主流道拉料杆头部的凹槽成了有效的底切，可以用来拉出主流道或者是下进料设计中的二级主流道。