Section 144-232-8-805.0 - PRESSURE TANKS805.1Storage capacity: Pressure tanks should be installed to the minimum capacity recommendation of the pump and motor manufacturer. Tanks shall be constructed of materials that are not hazardous to the water quality.805.2Relief valve: At least one (1) relief valve shall be required for a submersible pump installation. A shutoff valve shall not be installed between the pump and the relief valve. The installation of a relief valve shall conform to a minimum of the current State of Maine Internal Plumbing Rules Chapter 238, Section 11.10-144 C.M.R. ch. 232, § 8-805.0