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Help with Manholes and Manhole Covers specifications:

Construction
   Material       
   Your choices are...         
   Precast Concrete       Precast manholes are usually made of concrete produced in sections at a factory and assembled at the site. 
   Fiberglass       Fiberglass is used with plastics to create an environmentally sound and strong structure. 
   Polyethylene       Polyethylene is a type of plastic used in the construction of manholes. It is highly corrosion resistant and environmentally safe. 
   Other       Other unlisted, specialized, or proprietary materials. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Shape       
   Your choices are...         
   Round       Some manholes are produced to be round or cylindrical in shape. 
   Square or Rectangular       Some manholes are produced to be square or rectangular in shape. 
   Other       Other unlisted, specialized, or proprietary shapes. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Application       
   Your choices are...         
   Communications Manhole       Communications manholes are for underground telecom and communications lines. These manholes are used as junction places for wiring. 
   Meter Manhole       Used to measure flows in drain lines. The monitoring system sends an alarm when an acceptable pollution level is exceeded. 
   Power Manhole       Underground power utilities use power manholes to gain access to power cables. The manhole is a junction point for distributed electric power. 
   Replacement Liner       Replacement liners are built specifically for inserting into old manholes that are dangerous. 
   Sewer Manhole       Sewer manholes include effluent as well as storm water handling. 
   Other       Other unlisted, specialized, or proprietary configurations. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Specifications
   Length       The length of a square or rectangular manhole. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Width       The width of a square or rectangular manhole. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Height       The height of a square, rectangular or circular manhole. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Diameter       The diameter of a circular or round manhole. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
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Manhole Covers
           
   Your choices are...         
   Hinged Flat       Attached to the manhole on top and allows access. The covers are available in various shapes 
   Removable Flat       Removable manhole covers are very common in street utility applications. The cover is removed completely to gain access. 
   Hinged Dome       The cover is a rounded device that is connected via a hinge. 
   Removable Dome       A removable dome is a domed cover that can be completely removed to gain access to the manhole. 
   Highway Traffic       Highway manhole covers are high strength covers used in heavy traffic areas. 
   Other       Other unlisted, specialized, or proprietary configurations. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Features
           
   Your choices are...         
   Integral Flumes       Flumes are integral, watertight chutes that are built into the manhole. 
   Access Ladder       The ladder allows a person to climb into the manhole. 
   Gas Detector       Gas detectors measure the level of gas in the manhole. They usually have an alarming device connected to signal a dangerous situation. 
   Lights       Integral lighting is built into the manhole. 
   Power Outlets       Power outlets are located inside the manhole. 
   Vents       Some manholes have the option of motorized and non-motorized vents. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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