the hiss is air going into the tube since it is under vacuum pressure. you don't need to break the yoke...just unscrew the stainless steal clips and twist it off. no need to have broken bits of glass laying around.
the hiss is air going into the tube since it is under vacuum pressure. you don't need to break the yoke...just unscrew the stainless steal clips and twist it off. no need to have broken bits of glass laying around.
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