Axiom is  a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
Polybutylene is simply a type of plumbing material that was manufactured between the late 70's and early 90's. It is thought that it was installed in over 6 million homes during that time period.
A wall that supports a floor or roof of a building. A water faucet to which a hose may be attached, also called a hose bib or sill cock. Seeping of resin or gum from lumber. This term is also used in referring to the process of drawing air from water pipes.