gazz coughed up some electrons that declared:


where the hose was pushed onto a pressure switch, about the size of a tea
cup, was a diaphram inside, spring loaded with an adjustment screw in the

That sounds about the same form factor as a washing machine level sensor.


unfortunately at that place they used a 'rrrriiiiinnnggggg' type door
bell, which was fine if cars ran over it, it's go 'ding ding' but when the
trucks came to fill up one of hteir trailer tyres would be on the hose,
and the damn bell would ring all the time.

Do you remember when traffic lights had this sort of setup, with two hoses
set into the road?