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Grey tank
Yeah-vents are good. In addition to relieving air, they also help aerobic bacteria keep the tanks smelling good (well, not good, but better than the alternative anaerobic smell). I haven't installed my retrofit grey tank yet, but it does have vents on opposite sides. This is so if I park off level, I know at least one vent will be above the water level. If your tank is long and mounted across the centerline you may want to consider two vents. I plan to run them up opposite sides and converge at a single roof vent.
Also, mount a tee on one of the vents with the vent on the side leg and a threaded cap on the open end. You can use this as an inspection and dipstick port.
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