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 ?