Had the hose through it when I removed the old stat, it flowed crystal clear both ways I done that to make sure all the paraflu up was gone, I have also tried the hoses both ways and it didn't change anything, on mine now if I follow the hoses the bleed screw is top connector on the stat could you check yours just for piece of mind, thanks
Just double checked hose with bleed screw is top on stat
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