The HGB isn't ideal for most applications. Good for external overflows with height limitations but the stockman is easier and more reliable. The HGB is just a reverse stockman, you have to tune it by sliding the coupling and bushing assembly up to partially cover the side holes to closely match the flow rate and then for further tuning you need to insert a 1/4" tube into the pipe from the cap to exhaust the air from a precise location. More trouble than they are worth and from all the ones I've seen people use they end up reversing the coupling creating a plain old stockman.
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