Description:WASHING MACHINE RECIRCULATING PUMP KLEENMAID SUITS MODEL NUMBERS: kaw351wd stokeskm003 na3311wd3050REPLACES PART NUMBERS: ks31968 ks27065SPECIAL NOTES: nonePART NUMBER: KS31968P8DESCRIPTION: PUMP RECIRC @ KM003 KLEENMAID WASHING MACHINE BELT DRIVEN PUMP 4 OUTLETS RECIRCULATING

I can't answert your question about code -- but there is a world of difference between joining black iron or even plain steel to copper and joining galvanized to almost anything. Galvanized is zinc coated -- and while the zinc protects the steel, after a fashion, it aggravates corrosion when in contact with copper-- with the copper coming off the worst, frequently.

Most die-electrics on water heaters will leak. But there are plenty of WH tanks with copper male adaptors just screwed into the tank bungs and never a problem.

I've seen many copper to black & Galvanized steel, Brass to black & Galvanized steel that look as good as the day they went together.  Mad Dog 🐕