A supplemental fluid tank, preferably having two chambers each partially containing a fluid, fluid communicated intermediate a fuel tank and vent to reduce fuel vapor emissions, particularly for a boat. The HDCG includes a first vision detection feature. The apparatus is engageable with a computer numeric controlled machine. A basic connectivity test as well as a fault isolation test are supported. A level of the sensed one or more characteristics of the exudate fluid may be measured, and, in response to the measured at least one characteristic level, treatment may be applied or altered to the tissue site. The plug seal is movable between an open position spaced apart from the seal seat and biased towards the inlet and the outlet and a closed position against the seal seat thereby isolating the secondary connection from both the inlet and the outlet.