Hey guys. I just found some replacement o-rings that are an exact match for my LN-7 wire feeder torch connection. I'm pretty sure most Lincolns use the same O-ring size. Perhaps someone else can verify this? My two boxes of bulk random o-rings didn't have the size I needed.The dimensions are 1/2" i/d 5/8" o/d 1/16" thick. I have a heck of a time measuring a squishy o-ring, so I know it frustrates others as well. The dimensions were right on the package of the one I found that matched. I just ordered a 10 pack for 5 bucks on ebay so I'll have future replacements.Hope this helps someone in the future.AndyESAB 350 MPI ESAB 330I CVCCLincoln Idealarc 250Eastwood TIG 200Hobart Ironman 240Hobart Plasma CutterLincoln 110v MIGCH 110v MIGMK Industries Cobramatic with Prince XLMiller XR Wire Feeder