Nicest injector I've ever used is on a ploughing engine. It has a taper cock for the steam, and the injector overflow is lead upwards to the level of the top of the tank then turned down. The water valve stays open, all you have to do is gently open the steam cock. No messing, no waste on the road, one handed job that you don't even have to look at, only listen to. It's superb.
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