Question for red sea reefer tank owners

SteveDola

Good Tings
BRS Member
I am looking for the metric size for the Red sea reefer 250 return pipe...the actual pipe. I want to create a manifold on my return but dont know which union metric size it is to convert to US. Any help would be appreciated.

the original part number is

R42228​


I want to order a couple of these metric unions to be able to install 2 ball valves for future reactors.
 
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