I drop mine from my truck tailgate right on it Head. Hey I know dump ass mistake leaving a $10.000 piece of gear upright on a tailgate. After picking up the unit and doing a negative and positive test which it pass no problem, I notice a 1/4" ripe in the exhale hose. Cost about $70 to get a set delivered to house. I was shock that it didn't damage the Swagelok O2 feed. I guess the hose took all the weight, I think I'm the only diver that ever damage on of those heavy duty Meg hose.lesson learnedAl