"Richard Reynolds" wrote in message news:6pBNb.9809$ct4.4099@lakeread05...
or you need a better text book

mine lists several differences for

vinyl tubing smooth (assumes straight and round piece)
vinyl bubing ribbed (assumes straight and round piece)
pvc
abs

So what are the differences for those?
What is the loss on 5 feet of rigid PVC compared
to stright smooth vinyl? Or to ribbed one?