Brass Dezincification formally known as DR is the official Brass requirement for all Plumbing fitting sold in Australia and is starting to be recognized for its qualities in  N.Z Plumbing circles 2-3 of the major Companies will only handle D.R. brass
even if it is slightly dearer.  

 The Alloy is as follows 486(SMH) Copper 60.75%  Lead 2% Tin 1% Arsenic 0.15% Zinc36.10%
Barclay Engineering is attempting to use D.R. material in all our Plumbing fittings and under seawater conditions is found very satisfactory.