Do Fox remote res coilovers loose nitrogen over time?

[Payton34]

How often should they be checked n filled.  I thought they were sealed but then noticed a valve on the reservoir 

[500sks]

The valve is used to charge the nitrogen when new or after a rebuild. Don't try to check it there is a small volume of nitrogen and your checking it will lower the pressure also the pressure maybe 200 psi. Not sure what shocks you have.

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