collar 146 from the end of the conduit 148 as the seal breaks an ink meniscus forms across the gap between the collar and the end of the conduit 148 the shape of the end of the fixed valve member 128 directs the meniscus to travel towards the middles of its bottom surface instead of pinning to a point at the middle of the rounded bottom of the fixed valve member 128 the meniscus is driven to detach itself from the now almost horizontal bottom surface to achieve the lowest possible energy state the surface tension drives the detachment of the meniscus from the fixed valve member 128 the bias to minimize meniscus surface area is strong and so the detachment is complete with very little if any ink remaining on the cartridge valve 114 any remaining ink is not enough a drop that can drip and stain prior to disposal of the cartridge when a fresh cartridge is installed in the printer the air in conduit 150 will be entrained into the ink flow 152 and ingested by the cartridge in light of this the inlet manifold and filter assembly have a high bubble tolerance referring back to fig1 the ink flows through the top of the fixed valve member 128 and into the roof channel 138 being the most elevated point of the inlet manifold 116 the roof channels can trap the bubbles however bubbles may still flow into the filter inlets 158 in this case the filter assembly itself is bubble tolerant bubbles on the upstream side of the filter member 130 can affect the flow rate u2014 they effectively reduce the wetted.