Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners.

阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。

youdao

Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners.

阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。

youdao