The name written above should be Trofáguas - An Environmental Services company
The lid is similar to other caps made by the same manufacturer and of the same brand, but is found in other countries, with minor changes in the text on the lid: Spain
,
, Italy
and Greece
GS - Spheroidal graphite cast iron - a special cast iron in which the crystallization of carbon has been slowed down, which makes it close to steel - also called ductile iron (Thanks to Vuori Susi for the clarification)