... & F)Basic form gasketGasket with an inner ring Tongue and groove flange(T & F)Basic form gasketGasket with an inner ring Flat ... and groove flange(F & G)Basic form gasketGasket with an inner ring ... SP-44,API 605,DIN,JIS,JPI,BS 1560,JG/T,GB/T,HG,SH, etc. Or the demands can be designated ...