Old 09-30-2018, 04:19 AM
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Join Date: Jul 2011
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doesn't sound that way;
Seastar install instructions:

a) A compensating line is required between helm stations or the helm and autopilot power pack.
b) All hoses should be routed with a gradual rise (particularly the compensating line) so that air will not be trapped in the lower helm station.

Btw there are vented & non-vented helm filler plugs -
lower helm gets non-vented, upper gets a vented plug