The propane was pure, just R290 - in fact just search R290 in ebay. I got it from ebay uk, they called it: "Embraco compressor R290 gas 370 GRAM REFRIGERANT CANISTER CYLINDER BOTTLE"
The regulator was also from ebay uk, and it was called: "Fridge Freezer gas R290 R600a BOTTLE ADAPTOR service Valve"
Pic shows items that look identical to mine. Nb: my regulator was supplied in the ON state, and I should have turned the regulator OFF before fitting it. Oopsy.
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