RFCS-23 TIG pedal Ebay (mine).

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http://cgi.ebay.com/ws/eBayISAPI.dll...m=180808540228RFCS, not RFC.Fits some HF, some Synchrowave, some Maxstar but download and check thy manuals to be sure since Millers take a variety of different pedals.
Reply:I may be missing something, but your ad mentions this fitting an HF-251... my HF-251 only has the 14 pin connection though.
Reply:Nope.As an example, these are listed as fitting the HF-250 D-1 and HF-250-2 in page 41 of their manual. "Accessories" are typically at/near the last page.
Reply:Didn't sell. No problem! It will go in the spare pile instead because I got curious and hit the manualsFound out the difference between the RFCS and my RFC-23 (fits my 340 as well as the 330 AB/P etc) is the wire-wound resistor value and (obviously) the cabling. Opened both pedals and the resistors are physically interchangeable.The RFC 23 resistor is about 34 bucks at http://miller4less.com and the matching Amphenol MS3102A-16S-8P is about ten bucks online. Adding the panel Amphenol won't negate the original twist-lock plugs and will let me use this or, more usefully, my other pedal that has a hundred foot cord.Those not wanting to drill a hole in their front panel could make an inline adapter using two twist locks, but that's more expensive unless you have the twist lock plugs etc. handy.Pic from my older RFCS is typical layout; Attached Images