Details of these American injectors are on "www.eccentricengineer.com/injectors/small-scales-injector" but are very expensive. They appear to be based on the Penberthy lifting type. In the 1990s similar model vertical lifting injectors were supplied in this country by Terry Baxter of Double B Designs. They were apparently highly regarded. I believe the injector side of the business was sold to Bruce Rice of R.A. Barker whose website now only mentions a 3 pint injector in production but no further details.

I am proposing to put a "dummy" Penberthy injector on the tank top of a scale 7 1/4" gauge locomotive under construction. I then want to hide a working normal vertical injector in an adjacent coal bunker. It would be very convenient to take the overflow pipe up from the latter through the dummy Penberthy above.

Essentially then, two questions. Does an injector overflow outlet have to be below the level of the injector? Will a vertical (or horizontal for that matter) injector work if permanently flooded with water from the supply so that only the steam feed valve needs to be opened to start operation? This would mimic the prototype original Penberthy.