Air out on a Rental SPG reading 500psi, Advice appreciated...

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Out of curiosity, in a SPG with a swivel, my understanding is that the swivel itself is not water tight because it has no o-rings. The o-rings are on the swivel bar .

So water will enter and touch the middle of the swivel bar but will not enter the part of the SPG after the swivel bar.

Does that mean that I should detach the SPG from the hose and clean from time to time this area to prevent a build up ?

 
https://www.shearwater.com/products/perdix-ai/

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