Almost finished this bit .Just got to cut the shaft down and get a suitable knob .Thinking knurled brass .
Fitted a sight glass tube so I can check water level in RC .
Ended up ordering one for a 10Liter Zip hot water urn.When it turned up it was Plastic so it easily cut to size .Filed new grooves in it for the Oring seals and it fitted nicely inside some 1/2" that I soldered to some 1/4" compression fittings .