... sealing element for pipe, valve, pump, thermal exchange, condensing motorcycle, auto vent-pipe, tower, plain hole and hole of flange and ... .Supplying Specification: Dn10-----3000mmType of the gasket: 1. R type: the basic type is the gasket used for the splineway typed flange;2 ... . IR type: the type with inner ring is the sealing gasket used ...