Oatey Standard Pipe Clamp allows fast and easy installation of all types of copper tube size (CTS) and drain, waste and vent (DWV) sized pipingClamp design allows pipe to be flush mounted to walls and joists,Minimizes the transmission of water line noise,No corrosion made of durable polypropylene (gray color),Ribbed design allows pipe to cool faster and expand/contract freely,Can be used on hydronic systems