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What is minimum Size of 2" Main drain test valve as per NFPA13?

Question asked by nilangekar on Nov 15, 2018
Latest reply on Nov 19, 2018 by r.moraler

What is the smallest main drain test size permitted by NFPA13?,  I have noticed ACV is fitted with 11/4" drain valve,  is it acceptable?  or 2" drain test valve can not be smaller then 2"?