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If that is the four-way shower 'controller', then yes...
That's not it. For a galvanized connection To your valve I'd come off the valve with 1/2" galvanized street ells with a short nipple...

Galvanized pipe plumbing: connecting water pressure controller , what type of coupler/adapter do I need to finish installation. The pipe has to connect into the elbow AND the 'pressure...