I can't argue with that. I've a spare one in the car but it's the one I took of when I thought I was having problems. Swapped it with another used but unknown one off a spare engine but the fault turned out to be a faulty pipe.
On some pumps the valves are swaged in which can be a bit hit and miss, literally. You can try and re do yours. Hold the pump solidly in the vice, reseat the valve and redo the swages with a small flat punch. Usually 2, maybe 3 of them. Add another couple if they are damaged but be careful. A small tap is all that's needed, it's only alloy and a heavy hit likely to distort the valve.