3 inch Singlewall Adapter. This adapter allows ADS singlewall corrugated drain pipe to connect to 3 inch clay or ADS triplewall pipe. Made of high density polyethylene (HDPE), the adapter is designed to last the life of the drainage system. It is underground rated and has a maximum working temperature of 150°F. It is warranted to be free from defects in materials and workmanship in normal use and service.