The OPD is a float that blocks the outlet. Thee is also a valve like the
one on a tire valve that must be pushed in. If the OPD gets forced tot he
top of the tank it will shut it off or severely cut down the amount of gas
escaping. If you wee able to knock it on its side it would be even better as
it is designed to stop leaks from a tank in your trunk that gets knocked
Q: What is an overfilling prevention device?
A: As defined by the National Fire Protection Association's Pamphlet 58 -
LP-Gas Code, 1998 Edition (Code), it is..."A safety device that is designed
to provide an automatic means to prevent the filling of a container in
excess of the maximum permitted filling limit."
I use a turkey fryer to boil corn in the summer and I've had it go
into blow-torch mode at the air mixture thingy. After the first time
that happened I make sure that that orifice is pointed away from the
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