Specifications include, but are not limited to: The Contractor shall remove and dispose of leaking portion of pipe from elbow past second hot water tank that is currently out of service. The Contractor shall Install 5 inch X 4 inch reducing couplings between tanks and near elbow. The Contractor shall install 4 inch flanges and new butterfly valve between tanks. The Contractor shall install new 4 inch copper piping from new valve with branch to storage tank, replace present butterfly valve, 45 degree elbows, place new valve at tank and reconnect to present piping at 90 degree elbow. All new pisping is to be 4” type L, hard copper with pro-press fittings, 4” lug styule butterfly valves with Alum. Bronze Disc. SS shafts EPDM rubber seats and 10 position handles.