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Comparison : Item # 6540 04-04-02, 6540 Series 1/4 Inch (in) Tube 1 Outside Diameter Reducer Branch Union Tee Fitting
Item # 6540 04-04-53, 6540 Series 1/4 Inch (in) Tube 1 Outside Diameter Reducer Branch Union Tee Fitting
Item # 6540 06-06-04, 6540 Series 3/8 Inch (in) Tube 1 Outside Diameter Reducer Branch Union Tee Fitting
Item # 6540 08-08-04, 6540 Series 1/2 Inch (in) Tube 1 Outside Diameter Reducer Branch Union Tee Fitting
Item # 6540 08-08-06, 6540 Series 1/2 Inch (in) Tube 1 Outside Diameter Reducer Branch Union Tee Fitting