This Skinny Wrench is inexpensive and designed to fit in the tight space between the P-37 or MP-37 and the top of the boiler.
It is 3mm thick and sturdy for the job. In combination with the steam valve removal tool, removing and reinstalling the safety valve assembly can be approached without taking your machine to a pro shop.
Note: Box end is not accurately sized, but it is also not used for this application - only the open side is, and it fits as it should.
