This ADS 1265AA 12" split coupling has embedded bands that hold it together. It is intended for both single- and double-wall culverts that have 12" diameters. This is NOT to be used for culverts larger than 12" in diameter. It is used to make a strong joint by snapping over the ends of corrugated pipes. This culvert split coupling is a genuine part manufactured by (ADS) Advanced Drainage Systems.