The President of the Kurdish Regional Government of Iraq (KRG) said that he cannot confirm that it was the Kurds of Turkey (PKK) who attacked the Erbil-Ceyhan pipeline.
Map 1 Erbil-Ceyhan Pipeline (EIA)
https://www.eia.gov/beta/international/analysis.cfm?iso=TUR
Articles
“PM Barzani unsure who sabotaged Erbil-Ceyhan pipeline, not blaming PKK”, February 2016
http://rudaw.net/NewsDetails.aspx?pageid=197571
“Turkey” EIA