IMHO.....for 8 or 9 bucks on ebay are the non-vacuum type cheapos with screens, good enough for an emergency spare. (note they should be turned to OFF for overnight or extended parking)
Up to you to keep your oldie for parts (just in case)
Note new OEM petcocks are around $75...a spare part from the oldie may just salvage and save that in the future.
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