About this item 2Pcs-4pcs Premium Quality: The Female Swivel Coupler Union Fitting are machined from lightweight 6061-T6 aluminum for strong strength and good durability. Black anodized for great appearance and anti-corrosion. Size: Female to Female 6AN Union Fitting Thread size is 9/16-18 UNF Female to Female 8AN Union Fitting Thread size is 3/4-16 UNF Female to Female 10AN Union Fitting Thread size is 7/8-14 UNF.
