What is DWV Pipe?

JONES STEPHENS 4 in x 3 in Cast Iron Push-In Water Closet Flange for 4 in Cast Iron or Sch 40 DWV Choice of closet bolt slots or

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

dwv99 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 DWV PE pipe PVC DWV PVC pipe PVC thin wall Stainless steel - grade TP - 409 slots , and FS DDD - S