Brake banjo washers. Brake crush washer. Copper crush washer. 10mm copper washer.

Brake banjo washers. Brake crush washer 10mm. copper washer. Call em what you like. the crush washer that seals the ends of brake and clutch lines. We usually replace these with fresh ones when swapping out brake hoses, brake master cylinders etc. Because they crush. Sometimes you can see the marks from bolts they've been tightened with. One use.