| How many vents do you currently have in the coach? Mine has 3. Two in the rear for the shower and sink and one for the kitchen amidships. I like your plan for the new gray tank.
I would connect the kitchen sink drain to the tank vent and eliminate the extra fitting on the gray tank under the floor.
I would also add a vent to the common bath sink and shower drain with a stack coming up the curbside wall. This would eliminate possible gurgling in the bathroom fixtures when the kitchen sink is emptied. It would also provide a backup if one vent became plugged.
Just remember what free advice is worth,
Tom.
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