â¢ Surname is the family name or the last name of a person, whereas first name is the unique name given to a person at birth, also referred to as his Christian name. â¢ Surname is passed down generations, whereas first names are unique depending upon physical attributes or circumstances at birth of a kid.
PVC pipe is available in a wide range of wall thicknesses and strengths (pipe. stiffness). PVC pipe is routinely perforated (slotted) and used as well screen. This same slotted pipe can also be used for toe drains. Slotting is done at the. factory, and slots are available in a wide range of slot widths and POA.
The first plastic pipe to be used was ABS, which is black. Since the 1970s ABS has generally been replaced by white-or cream-color PVC pipe. In rare cases drainpipes are made of copper. Drainpipes must be sloped, usually about 1/4 inch per foot, so water can run freely through them.