The guts of either an early or late proportioning valve (they're very different) should come out when the hex cap is unscrewed. If not, you have 2 choices: you can dig the stuff out somehow, then braze a cover over the threaded opening, or Larry Stock's PPC in Reno has gutted & brazed valves available in trade for yours. I've never found a tee fitting for Euro bubble flairs, in any size.
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