I could not find a Miller part so I called and was able to locate a hard to find part which they shipped and received in a few days.
Sumner 786067 EXPANSION PLUG,3.5" (87.5MM)
Sumner 786067 EXPANSION PLUG,3.5" (87.5MM)
Sumner Part Number 786067
EXPANSION PLUG,3.5" (87.5MM)
Manufacture: Sumner
Regular price
$12.16
Regular price
Sale price
$12.16
Unit price
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per