There are standard O-rings, but it is realy important that you use the right size and change the oil or keep the right amount of oil in the gun. Remember that the mixture of Oil and compressed air is the life of your gun seals.
Once that you identify the right sizes of the different O-rings you are done, they are absolutely inexpensive.
If you service your gun once a year, even if it has no leaks, it will last forever.
Ivan
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