Oatey 33877 Pipe Clamps, 1-Inch, Gray The product is manufactured in China The product is highly durable and easy to use Easy installation and easy handling Clamp 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