Used -6 female O-ring seal to -4 male flare reducer. This fitting is made from billet alum. and allows a racer to take a AN O-ring hose end and adpt. it to AN male 37 degree JIC.
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.