Specifications include, but are not limited to: k. The work under this Section shall consist of furnishing all labor, materials, and equipment required for the installation of fire hydrants, all in accordance with the details shown on the plans and the requirements of these specifications (see TW Standard Detail 500). The fire hydrant shutoff shall be of the compression type that provides for closure of the main valve with water pressure. The valve action shall provide positive shutoff at minimum closing torque. Wedge action closing gates and scissor-type main valves shall not be permitted. The inlet connection shall be a mechanically restrained joint unless otherwise specified. The main valve opening shall be a minimum of 5-1/4 inches. The fire hydrant shall be designed with O-ring seals to protect the operating stem and threads from water. The seals shall be of the double O-ring type. The O-rings shall move against a bronze, stainless steel, or other non-corrodible metal surface. O-rings shall comply with ASTM D2000. Upper stem thread lubrication shall be accomplished with either oil or grease. When oil is used, it shall be in conjunction with a functional oil reservoir and oil filler port. The lubricant shall be suitable for a temperature range of -40 degrees F to +150 degrees F. Field lubrication shall be accomplished without disassembly of the unit. Unless otherwise noted, component parts for dry-barrel fire hydrants shall be in accordance with AWWA C502. All components of dry-barrel fire hydrants shall be tested and certified by an approved testing laboratory located in the United States. All component parts shall be readily available. The fire hydrant’s body between the elbow and the top cap shall be fabricated in two parts connected by a swivel flange or breakable flange that permits positioning of the nozzles in any desired direction. The fire hydrant shall be installed such that when the fire hydrant barrel is broken through any cause—including vehicular damage—it can be replaced without disturbing or replacing the portion of the hydrant below the ground line. Provision shall be made in the manufacture of the stem to allow the stem to be disconnected from the parts above the break point. If breakable or sleeve-type couplings are used, they shall have sufficient torsional strength such that failure of the stem shall occur at a point other than the coupling. The coupling shall be manufactured such that no parts shall be dislodged and fall into the barrel of the fire hydrant, and that the break shall not occur through the pins or bolts holding the coupling to the stem. All parts shall be removable from ground level without excavation of the fire hydrant.