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Sigma Thermostatic Extension Set Long Length 18.30.216
Sigma Thermostatic Extension Set Medium Length (2-3/8" Threaded Tube and 3" Square Tube) 18.12.069
Sigma Thermostatic Extension Set Long Length 18.30.217
Sigma 5" Square Tube 18.30.087
Sigma 1-1/4" Square Tube