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Why would the water guns (WG1, WG2) burst or bubble?

This only happens when the guns are on a steam return line. (That’s why these guns should only be used on cold water lines at a psi of 80.) Even though the return line has water in it, the temperatures can reach up and over 300°F is some locations on the line which could damage the plastic casing of the water gun. Also, there is also “flash” steam present on return lines that could cause the guns to burst.