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3/8″ Copper Washer is used on brass adaptors to achieve a positive hydraulic seal. Also to join dissimilar metals.
Hydraulic brakes used on boat trailers use a 3/16″ unf bundy tube. The actual thread size is 3/8″
Copper washers are a handy item to connect different materials together. For example, when connecting a brass adaptor to a stainless caliper, use a copper washer.
Dissimilar metals can leak when not perfectly connected.
Couplemate recommends thread sealer on all joiners. Although the convention says thread tape is not required when connecting brass parts, we prefer to be sure of a good connection.
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