国精产品99永久一区一区,强奸乱伦影音先锋,最近最新中文字幕大全免费版,精品国产国产综合精品

　　Insulated flange use: is also on the requirements of the buried steel pipe sealing performance and electrical corrosion protection required by the electrical insulation of the pipe flange fittings collectively. It consists of a pair of steel flanges, insulated seals between the two flanges, flange fasteners and fastener insulation parts, and a pair of steel spools that have been welded to the two flanges.

　　Insulation flange and insulation connector for the oil, chemical and other industries to produce products, it is simple structure, the use of safe, reliable, widely praised by users. Insulated flange products have formed a series, when there are special circumstances, according to user requirements and design and manufacturing.