LPG filling stations fit forklift tank filler valve threads (1-3/4 ACME) not standard 20lb BBQ tanks threads. The 20lb BBQ threads are male 1-5/16″ ACME (OPD) threads, however most adaptors fit on the inside like this device designed to refill 1lb tanks from a standard 20lb:
Where can an adapter be found to simulate a forklift tank filler valve?
How to fill a 20lb BBQ Propane tank with LPG
propane
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Best Answer
If I understand correctly you want to adapt a 1" P.O.L. to a 1-3/4 ACME so that you can fill your BBQ propane tank with a different connector.
In that case you'd want something like this.
1-3/4" ACME to 1" POL Adapter
If you do get something like this, make sure it comes preassembled, or assemble carefully with yellow teflon or propane rated pipe dope.