The product is used in the connection between secondary outlet copper tubes (generally speaking,they are side outlet lines) of the electric furnace transformers and short-net copper tubes of electric furnaces, in order to balance the installation errors and avoid resonance caused by AC electromagnetism of heavy-current lines. The GW series compensators and the copper tubes are connected by nuts (single nut or double nuts), while the GB series compensators and the copper tubes are connected by flanges.The connected copper tubes at the two ends can have same or different diameters. Copper tubes with same diameters are recommended.