Bypass hose and fitting dilemma

12many said

Just in case anyone is researching bypass hose fittings, just got this machined 3/4npt stainless bypass hose barb, a tick under $19 shipped from a seller on EBay. Looks nice enough, maybe nicer than an iron pipe stub, is more pricey than most options given already, but much cheaper than the Mopar barb that's available.

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Perfect thats it exactly except I'm pretty sure Stainless will react with Aluminum. From a metals Article I read:

Last Updated on October 4, 2018

Corrosion develops when two dissimilar materials are combined in a corrosive electrolyte. This can occur when certain materials (such as aluminum) are in contact with stainless steel.

The most common solution to prevent galvanic corrosion is to select metals that are close together in the galvanic series. Separating the metals that are incompatible reduces the risk of these cells deteriorating. According to the levels of galvanic corrosion, stainless steel that comes into contact with materials such as copper is less likely to be a risk than when it is in contact with aluminum.

Although aluminum reacts negatively to stainless steel, large surface areas of aluminum to stainless steel can be acceptable depending on local environmental conditions. Severe corrosion is likely to take place in a marine environment. However, there are methods that can be used to reduce this effect. A good way to reduce corrosion is to use an isolating coating or paint on the aluminum and the steel to isolate them electrically. Insulating washers are also effective in isolating the two dissimilar materials and creating a relatively safe surface area.