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Propane “container” is a general all-inclusive term used to describe a vessel that is used for
storage and delivery of propane gas.
DOT (Department of Transportation) cylinders are transportable and are commonly used on
recreation vehicles. The capacity of DOT propane cylinders is expressed in pounds. DOT
propane cylinders are required to be removed from the RV for lling and must be lled by
weight by a qualied propane facility. DOT Propane cylinders are equipped with an OPD
(over ll protection device) designed to reduce the potential of overlling. DOT propane
cylinders are also equipped with an ACME service valve that is for connection of the TYPE
1 ACME pigtail hose assembly to the RV two-stage regulator.
The TYPE 1 ACME pigtail hose assembly is a wrench less, right hand threaded connector
that features a thermally sensitive sleeve and excess ow device. Max output is 200,000
BTU/hr. It is used to connect propane cylinders to regulators, hoses and other ttings. It is
not for use on gas grills and other low pressure devices. DOT cylinders equipped with an
OPD and ACME type 1 service valve are identied by the triangular service valve knob.
DOT cylinders are typically marked with “top” or an arrow to indicate the correct orientation
of the cylinder(s). Do not mount, store or transport any cylinder other than the in proper
position indicated.
Be sure to securely re-install DOT cylinder(s) after they have been removed for lling or
replacement. Always close the service valve and install a dust cap or plug when transporting
or storing disconnected containers whether full or empty.
ASME tanks are permanently mounted to the RV and are commonly used on RV mo-
torhomes. The capacity of ASME tanks is expressed in gallons. ASME tanks are lled
while the tank is attached to the motorhome by a qualied propane facility. ASME tanks
are equipped with an automatic stop ll valve designed to reduce the potential of overlling.
ASME propane tanks are also equipped with a P.O.L. service valve that is for connection of
the supply hose with a left hand threaded brass P.O.L. tting from the tank service valve to
the two-stage regulator. Not for use on gas grills and other low pressure devices.
Laying a DOT propane cylinder on its side may potentially create a very
dangerous situation.
Keep the pigtail hose away from sharp edges
of the cylinder collar, rigid corners, walls, doors or other compartment
structures including the cover.
Shut o gas to all appliances by closing the
propane gas main shut o valve. Always shut OFF any engine before
refueling. Do not smoke and do not operate other ignition sources while
refueling.
Do not attempt to service a propane container overll yourself.
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