- Why are copper washers required on banjo fittings?
- Why do they need to be replaced each time you remove/loosen the banjo fitting?
I'm assuming that copper is a softer metal than bronze, brass or steel so they will squish when torqued to make a seal. However, I've seen copper crush washers that had an embossed ring in the center of the washer that would actually crush down when under pressure. Today I had to replace the washers for an oil feed line for a turbo but the manual calls for copper washers and not crush washers. Do the flat copper washers work in the same way?