Product Description：

Materical:Silicone

This Silicone bolt caps with duckbill valve,just leak air evacuation valve,also can like as grease injection fitting.

Silicone caps is soft caps ,so it is fit to bolt and nut,in the cap botton can used self adhesive adhesive with steel 

Keywords： One-Way Cross Check Valve Bolt and nut protectioncaps

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