Specifications include, but are not limited to: Fresh water tanks shall be sealed for personal hygiene. Snap in water bladder bags are not acceptable. Minimum 400 gallons gray water and 400 gallons potable water holding capacity. Potable water tank shall be constructed of food grade safe, non-corrosive and nonabsorbent material. Tank shall have smooth easily cleanable surfaces and shall be designed with an access port for inspection and cleaning. The access port opening shall be flanged upward at least 13mm (1/2 inch) and be equipped with a cover to overlap the opening. The entire inside of the tank shall be visible for an ocular inspection. The tank shall be sloped to drain completely. Each tank shall have the size and description stenciled on it in letters no less than 4 inches high (for example: "400-GALLON POTABLE WATER” or “400-GALLON GRAY WATER”).