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Old 12-07-2017, 02:31 PM
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From Pegasus

Soft annealed copper crush washers are most commonly used for brake banjo fittings and to seal brake adapters to spot-faced ports. Aluminum washers are commonly used on fuel system banjo fittings and carburetor adapters

These aluminum washers with molded Buna-N inner seals are much
more reliable than the more common (and somewhat cheaper) steel
Stat-O-Seals. Even if the rubber portion fails to make contact all around
the port, the aluminum will act as a crush washer, providing a reliable
metal-to-metal seal. Use them to seal screws, bolts or plumbing fittings
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