... ,thermal exchange,auto vent-pipe, hole of flange and etc Spiral wound gasket:static sealing element of pipe, valve,pump,thermal ... b) IR type: spiral winding with inner ring c) CG type: spiral winding with outer guide d) CGI type: spiral winding with outer guide and inner ... , teflon strip.5): size: 1/2"-48"6): ASTM, DIN Spiral wound gasket