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?
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Dale
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Just another question where OP's location may be of help. I know of somewhere in UK that probably makes just what you need. – Tim Feb 04 '23 at 15:11
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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.

(source: ebayimg.com)
If you do get something like this, make sure it comes preassembled, or assemble carefully with yellow teflon or propane rated pipe dope.
Glorfindel
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Rob S.
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1You are right, The 1" POL end fits inside and the 1-3/4" ACME is the Forklift tank threads. 1-5/16″ ACME (OPD) is what a standard BBQ has. – Dale Jan 19 '16 at 18:56