Coupling With stop Application Compressed Air Hydronics Industrial Gases Marine Fitting Side A Connection Type Press-Fit 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 2 1/2 in Fitting Side B Pipe Size 2 1/2 in Material Grade 316 O-Ring Material FKM Specific Fitting Shape Coupling With Stop Finish/Coating Zinc Nickel