Before extrusion, the HDPE can be pigmented to yield color-coded pipe. Common PEX tubing colors are natural (hazy clear, unpigmented), white, black, red and blue. The red and blue colors are used to help plumbers and homeowners distinguish between hot and cold water supply lines.
No, there has never been a US President from an independent party; however, at the time of his presidency, George Washington was not affiliated with a political party at all, as there were no parties in the brand new United States of America.
The American Cincinnatus: Like the famous Roman, he won a war, then became a private citizen instead of seeking power or riches as a reward. The Father of His Country: For being the foremost leader of the American Revolution and the first president under the new Constitution.