With the WG re rout pipe being so short it shouldn't have any cracking problems. The heating and expanding will match the DP very closely. If the tube was a foot long or so then you'd need a flex.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.