A friend passed me an old Harris CO2 regulator. I tested it by daisy chaining with another one, and it doesn't hold pressure. No model number, marked "made in USA", brass body. Any suggestions?
Or take it to welding supply house they should have harris rebuilds don't believe they changed much in the last 15 years
Harris (now owned by Lincoln) has been around for ages and is a quality brand with lots of support. Certain welding shops may be able to rebuild it, it could just a seal someplace.