The Rt on-off probably has a slightly different fit compared to the classic on-off. That tiny difference is probably enough to overcome the body differences.
Looking to buy a MQ or MQ2 Valve autococker or a MQ pump. Please let me know if you or if you know anybody that is selling one. I have cash ready to buy.
I had replaced the Teflon o-ring with no luck. I think I still have a quad o-ring hanging around from my emag. I'll try that out of curiosity. Any reason