Types of Piping Systems Older homes built before 1960 used galvanized steel or cast-iron pipes for drain/waste/vent (DWV) systems. DWV systems remove wastewater and prevent the flow of sewer gases into homes.

What does DWV mean in plumbing terms?

Types of Piping Systems Older homes built before 1960 used galvanized steel or cast-iron pipes for drain/waste/vent (DWV) systems. DWV systems remove wastewater and prevent the flow of sewer gases into homes.

What does DWV mean in PVC?

PVC Schedule 40 Pressure/DWV Pipe (drain, waste and vent)