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@disq
76projects "hi flow no clog" valves - there's no core to take out but it seemed to seat the (previously used/stretched for 1500km, GP5000S TR 28mm) tires very easily with the track pump. Didn't try to inject the sealant thru the valve, I could, but as long as the tire seats this easily there's no need to faff around and risk a mess.
Just make sure the valve is at the high position if you're bleeding air from a high pressure, "hi flow no clog" also means hi flow of sealant.