The pipe is about 12ins long, if you squeeze the bulb at the bottom, it lets out the trapped water. This one has had the rear of the bulb cut out to allow water to flow freely.
Hi Paul,I am in the process of rebuilding my heater box, i have come to a halt with the rod assembly in the centre. Mine was so rotten that i can't work out how it operates. If yours is still working or if you got the new one that was offered, could tell me or by photo/diagram what goes where. Many thanks.