The threaded end connects to the pressure tank and the flex/push on end connects to the pipe between the compressor and the tank but is before a one way valve see picture.
I know that if the pressure got to much the valve would open against the spring but the thing that I can't understand is that the push on pipe is pushed onto a solid stub with no hole through it at all ?. with the valve capped off the cut out works ok and when the compressor turns itself off there is no pressure at the flexi pipe?
I fully intend fitting a new safety valve but do I need to get one that incorporates the flexi pipe ?
Normally the flexible pipe from the non-return valve fits onto an unloading valve in the base of the switch, not one screwed into the connection between the tank and the switch.
Just a thought I bought this compressor second hand and wonder if that pipe had just been pushed onto the end of the safety valve spindle. I was assuming that it was piped through. This compressor is not quite the same as mine but the safety valve looks the same but without the pipe pushed on.

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