In this ship, we have different tank construction methods for different purposes. The tank shown here was recently delivered from our partners at Triple M Plastics in Kennebunk, ME. Plastic, or more accurately polyethylene tank construction is light and durable. This style tank is used across the industry for many different purposes. We chose to use this style for our grey water waste tanks. Unlike the black water tanks, these will never be pressurized and should serve their purpose very well for years to come.Bookmark the permalink.