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 U.S. Presidents. 1  Abraham Lincoln (1809-1865) is the only U.S. president who was also a licensed bartender. 2  The only president to be unanimously elected was George Washington (1732-1799). 3  Because the KKK was a powerful political force, Truman was encouraged to join the organization.