Gray water tanks February 24, 2011, 07:34:49 pm Yahoo Message Number: 6486I contacted Jayco with my question regarding the gray water tanks and this is the info, just in case someone else needs to know."On the Grey water tanks. The front bathroom grey tank capacity is 41 gallons and the full bathrooms grey tank capacity is 41gallons. Also, each tank is dedicated to each bathroom. They dont have cross over tubes. "thanksMo Quote Selected