Found their email:
Hello James,
We apologize for the unusual wait times below is the information on how this can be achieved. Feel free to email or call us for further assistance.
Hoping you are well. This can be achieved by doing the following:
SOURCE:
http://www.airforums.com/forums/showthread.php?t=189187
CREDIT: UncleBad
Here are the steps used to create a hose and valve for the Champion 3400-Watt Portable Dual Fuel Inverter Generator.
THE GENERATOR REQUIRES ½ PSI AND A FLOW RATE UP TO 76,000 BTU/HR WHEN UNDER FULL LOAD.
All the parts used can be found in this Amazon list:
https://www.amazon.com/hz/wishlist/ls/TXNB1SWETOFC
1 –
Remove the small regulator/LPG tank connector from the large pressure reducing valve, leaving the brass fitting on the large pressure reducing valve.
This leaves you with a 1/8 FPT male connection. You cannot change the length of the existing hose from this component to the generator. It is sized specifically for this valve.
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2 –
Connect a Reducer Coupling 1/4 " FPT X 1/8 " FPT to the male connection on the large pressure reducing valve using yellow propane tape.
This is the hard to find part, its included in the Amazon list below.
Sorry, I didn’t take a picture at this step.
3 –
Connect a 1/4" NPT x Full Flow Male Plug using yellow propane tape.
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4 –
This will create a hose that includes a pressure reducing valve with low pressure propane quick connects on both sides.
Then all you need is a low pressure propane quick connect hose, I chose one that is 12 feet long.