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.
Theodore Roosevelt. This was a 26th President of the United States; hero of the Spanish-American War; Panama canal was built during his administration; said `Speak softly but carry a big stick` (1858-1919). He was considered by many to be the nation's first conservation President.