Able to be supplied to meet such standards as MSS-SP-83 and ASME B16.20, spiral wound gasket unions provide Class 3000 Service. Seal is formed with replaceable spiral wound gaskets without need of ground joint, and flat face design provides turbulence-free fit across seats. Graphite spiral wound gasket union withstands up to 850°F for hydrocarbon, superheated steam service, and more, while silicate spiral wound gasket union resists up to 1,850°F for superheated and chemical service.