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Comparison : Item # YS-4-100, YS Series 1/4 Inch (in) Thread Size "Y" Pipeline Strainer
Item # YS-6-100, YS Series 3/8 Inch (in) Thread Size "Y" Pipeline Strainer
Item # YS-4-200, YS Series 1/4 Inch (in) Thread Size "Y" Pipeline Strainer
Item # YS-6-200, YS Series 3/4 Inch (in) Thread Size "Y" Pipeline Strainer