Reducer Application Compressed Air Hydronics Industrial Gases Marine Fitting Side A Connection Type FTG Fitting Side B Connection Type Press-Fit Fitting Side A Copper Tube Size Not Applicable Fitting Side B Copper Tube Size Not Applicable Fitting Material Stainless Steel Fitting Side A Pipe Size 4 in Fitting Side B Pipe Size 3 in Material Grade 316 O-Ring Material FKM Specific Fitting Shape Reducer Finish/Coating Zinc Nickel Fitting Side A Tube Outer Diameter 4 in