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

在浇口形模具或无流道模具中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.

主流道拉料杆头部凹槽形成了一个有效，可以用来拉出主流道或者是下进料设计中二级主流道。