I have for disposal two ½” Penberthy injectors that as far as I know are in working order though they have obviously been around for some time! One is a suction front/delivery back and the other is a suction left and delivery back.
What I need (!) is a ¾” injector that is suction front and delivery back in full working order. Model BB (330?)
I have a BB suction from the right, delivery to the left, it was the spare for my fowler roller. Not sure it's what your looking for but might be usefull.