What is DWV Pipe?

What is DWV PVC used for, and is it different from schedule 40 PVC pipe and fittings?

DWV R09 N62 Re - Westerscheldetunne Hoek Lichtkrant 11-07 - Pand Oud-Vossemeer op slot na vondst wi 11-07

dwv slot Delock Slot bracket 1 x 19 pin USB pin header female internal > 2 x USB Type-A female external Low Profile Item No : 82976

dwv gaming slot What is DWV PVC used for, and is it different from schedule 40 PVC pipe and fittings?