Plumbing Vent Stack and Pipe Fitting Diagram - Technical Illustration #212270 (License: Personal Use)

This black-and-white engineering diagram illustrates a typical plumbing vent stack system, featuring a central P-trap connected to vertical drain risers and a top-mounted vent cap. To the right, three detailed cross-sections depict common pipe fittings: a double sanitary tee, a dual-outlet hub, and a hexagonal compression fitting-each showing internal sealing surfaces and threading. The linework emphasizes structural integrity and flow direction, typical of 19th- to mid-20th-century plumbing manuals.

Used in plumbing education, code reference guides, HVAC/mechanical documentation, or DIY repair websites; targets professionals and homeowners seeking to understand venting principles, trap function, and proper fitting selection for drainage systems.