In the plumbing and piping industry, as in many others, the leading contractors and engineers pay attention to new products and techniques, and innovative applications of "ordinary" materials. They are eager to produce superior jobs or do the same job less expensively. One example of successful innovation is the widespread use of plastic materials for plumbing drainage, waste, and vent piping. While plastic drainage piping has become standard practice in most communities, few plumbers have rushed out to use plastic for water-supply piping. Residential plumbing contractors— in our area, at least—seem reluctant to accept plastic pressure piping. Codes are not the problem, as there appear to be no general code barriers. Many Options Part of the problem is simply the large range