DIN 3444-1997《带焊接螺纹端的管配件的护盖》
The document specifies protecting caps which are used during shipping and storage to seal the fittings against the ingress of foreign matters and to protect the blace of attachment from damage.
The document specifies protecting caps which are used during shipping and storage to seal the fittings against the ingress of foreign matters and to protect the blace of attachment from damage.