I wouldn't worry terry I'm sure your jbl reg is solid , my reg is an up aqua a-164 , I have no control of the needle valve what so ever , I either have 10 bps or 1bps I can't seem to find a happy medium ,once I find a consistent bubble rate it fluctuates again and i get a stream of bubbles then only a few , it's a shame as the solenoid is bang on , the reg may be ok with a better needle valve so I may sell it as spares ,
Cheers
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