Press Couplings, Application Natural Gas, Non-Potable Water, Propane, Fitting Side A Connection Type Press-Fit, Fitting Side B Connection Type Press-Fit, Fitting Side A Copper Tube Size 3/4 in, Fitting Side B Copper Tube Size 3/4 in, Fitting Material Copper, O-Ring Material HNBR, Specific Fitting Shape Straight Connector, Fitting Side A Tube Outer Diameter 3/4 in, Fitting Side B Tube Outer Diameter 3/4 in, Overall Length 2 1/4 in, Includes Center Stop Dimple Center Stop