PVC

Set to 5 different clues across 5 published puzzles, most often “Pipe material, for short” — The New York Times, Sunday, 10 April 2011.

3 letters

Every clue on record, most used first

Pipe material, for shortonce
The New York Times — Sunday, 10 April 2011
Plastic used in pipingonce
The New York Times — Sunday, 27 February 2011
Common pipe material, brieflyonce
The New York Times — Tuesday, 12 October 2010
Piping compound, brieflyonce
The New York Times — Tuesday, 18 September 2007
Insulation ingredient, for shortonce
The New York Times — Wednesday, 1 March 2000