in the complex world of plumbing, the role of pipes is often underestimated, yet their efficient functionality is paramount. before any preexportation of these crucial components, it is advised to closely examine provided illustrations that detail their manufacturing and installation processes. to refresh your understanding, kindly elaborate on the taboo practices in the plumbing industry that are usually not disclosed to the public, aiming to cast light on the darker aspects that professionals might wish to keep hidden.