interesting "can be used" sounds aproved . not covered by warranty sounds not aproved. I dont think Id expand zurn
btw saw a you tube video just now from 2017 a zurn ad. says expansion has 25 year warranty? no idea what current rules are
That is odd. Zurn even puts "F1960" on their print line as approval but says no warranty for expansion applications..
Sioux Chief both approves and warrants their PEX B for F1960 expansion, so if anyone plans to expand B, they should probably consider Sioux Chief.