SF6/N2/CF4 gas mixtures On-Site Services for GILSF6/N2/CF4 gas mixtures On-Site Services for GIL Units for GIL | Dilo Company, Inc Get Price! Units for gas insulated lines (GIL) For efficient handling of SF 6 /N 2 /CF 4 gas mixtures DILO supplies high-performance special application devices that gas insulated lines require.