Psi rating for radient floor heat panel test???

Well gents, you guys have helped me with everything from thermostat install to asphalt driveways, so here is today's conundrum.

As many of you know, I built a pole building with radiant in floor pex heating. I pressure checked the " in floor" portion and it held 50 psi for months and months.

Fast forward to today...I built and soldered the boiler/wall panel. Figured I would bench test it also. On saw horses in my basement I'm embarrassed to say, I have struggled with pressure...

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Author: Johnny Mac