"Danny"
"Danny"
Straight-seam electrically welded water and gas pipe after GOST 3262-75. These tubes are classified not by the actual OD, but by DN rated dia. That is why they are specified by their DN (rated diameter) and called by such nickname among plumbers There is one more nickname for this assortment sounding like "Wee-Gee-Peggy", due to the abbreviation "WGP" (water and gas pipe).
For details see: