SW: simple spiral seal used for fittings
with seat, where it is not necessary to limit the compression of the seal.
SWE: spirometallic seal with external centering ring, used for better positioning of the gasket in the flanged fittings, where it is not necessary to limit the compression of the seal.
SWI: spirometallic seal with inner ring, which prevents it from coming into contact with the fluid.
SWIE: spirometallic seal with outer and inner ring, ideal for applications where it is necessary to limit the compression of the seal and prevent it from being in contact with the fluid.
