| 摘要 |
The present invention provides improved gas service riser assemblies. The improved gas service riser assemblies utilize an adapter to provide the transition from the plastic pipe used for underground distribution of natural gas to the metal pipe used in above ground natural gas distribution systems. Further, the improved gas service riser assemblies do not utilize the protective metal casing as a conduit for the natural gas thereby reducing the hazards associated with corrosion of the protective met al casing. |
