Hey... tried to use the search feature... didn't find much... just had a 30 lb. tank filled... guy charged me for 7.8 gallons. I've been thinking all along that there were 7.1 gallons in a 30 pounder ...
The OPD is designed to work for the orientation of the tank. Different versions are use for tanks that will be mounted vertically than for tanks that will be mounted horizontally. My tanks mount horizontally so the OPD is not going to release pressure if the tanks are overfilled at a pump while sitting upright.
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