Disclosed is an improved ventilator apparatus for vehicle covers. The ink passes through the inside of the ink jet head, and bubbles existing inside the ink jet head move with the ink to the outside. The absorbent assembly includes a bodyside liner, an outer cover, and an absorbent positioned therebetween. The extension member is preferably biased toward the extended position and releasably secured at the marker end proximate the utility structure. Further, since jigs for fixing the antenna are needless, a reduction in the number of component parts can be contrived, and the antenna can be fixed without spoiling the appearance. The outermost layer of the gas flow is passed through the first gap from the flow duct into the droplet separation tube for separating the droplets, and the gas flow made free from droplets is passed through the second gap from the droplet separation tube back into the flow duct.