10AN ゴム・メタル クラッシュワッシャー (10個入り)

These stopped a slow leak I was battling in my hydraulic return line. The rubber and metal sandwich seals much better than plain metal washers, and the pack of ten gives plenty for future repairs.

Swapped out a leaking fitting on my fuel rail and these washers sealed perfectly on the first try. The rubber layer seems to grip just enough to keep it from slipping during tightening.

Exactly the right size for my AN fittings, and the rubber layer seals much better than plain metal washers I've used before. No leaks on my fuel line after a week of running.