6" Jacketed Hemispherical Reducer Compression6" Jacketed Hemispherical Reducer Compression This hemispherical reducer will go from a 6" tri clamp to a 1 2" Compression fitting. The compression fitting is the preferred choice for sanitary connections to eliminate possible contamination from particles getting stuck within threads. The jacket around the outside of the reducer has 2x 1 2" NPT ports to connect to a temperature controlled circulator.