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TIME-SERT Aluminum for racing applications. For more typical use in everyday automotive applications see the 51459 steel alloy insert. Outside diameter .686" or 17.43mm - this is measuring on the outside threads like shown in the 2nd image. Mouse over...

Water Bladder and S Hooks

19mm A/C Union (1)

16mm A/C Union (1)

3/4" A/C Union (1)

14.5mm to 16mm A/C Union (1)

5/8" A/C Union (1)

15mm A/C Union (1)

14.5mm A/C Union (1)

19mm A/C Block Off (1)

3/4" A/C Block Off (1)

16mm A/C Block Off (1)