American-Darling® and Waterous Pacer® Hydrants with ALPHA Bases

4-1/2" Mark-73 Sample Specification




  1. Fire Hydrants shall meet or exceed ANSI/AWWA C502, latest revision for use in water supply systems.
  2. Rated working pressure shall be 250 psig, test pressure shall be 500 psig.
  3. Hydrants shall be dry-barrel construction closing with and opening against the inlet pressure.
  4. Hydrant main valve closure shall be of the compression type.
  5. Traffic break feature to be designed for easy 360° rotation of nozzle section and incorporate the use of a 2-piece square rod and single cast-iron rod coupling secured with stainless steel coupling pins.
  6. The hydrant shall have a travel stop nut in the top of the hydrant to limit the travel of the hydrant rod. Hydrant designs that allow the valve bottom to stop against the shoe or employ a stop in the drain mechanism resulting in a bending moment in the rod assembly are not allowed.
  7. Hydrant upper and lower barrels and base shall be made of ductile iron.
  8. Hydrant to be Certified to NSF/ANSI/CAN 61 and NSF/ANSI/CAN 372.


  1. The main valve opening shall not be less than 4-1/2” and be designed so that removal of all working parts can be accomplished without excavating.
  2. The hydrant shall incorporate a draining system constructed entirely of bronze and positively activated by the compression of an e-coated stainless steel spring. 
  3. Hydrant drains shall close completely after no more than 3 turns of the operating nut.
  4. There shall be a minimum of two internal drain ports in the hydrant seat and four outlets in the hydrant drain ring directing water to the exterior of the hydrant.
  5. Hydrants employing sliding-style drains are not permitted.


  1. Hydrant barrels shall be constructed of ductile iron and shall have (1) pumper nozzle and (2) hose nozzles.
  2. The operating nut, all nozzle cap nut dimensions and the nozzle threads shall be in compliance with the standards established by the local authorities. 
  3. All pumper and hose nozzles shall be retained by a single-piece threaded ductile iron retaining collar. Threaded-in nozzles and nozzles using set screws or wedge pins are not allowed.


  1. Hydrant upper barrel shall be factory coated with an electrodeposition (E-coat) epoxy primer and a catalyzed two-part polyurethane top coat. Base shall be coated with fusion-bonded-epoxy. 
  2. All bolting below grade shall be Type 304 stainless steel.


  1. Hydrant inlet shall be designed for use with ductile iron, cast iron, HDPE and PVC pipe materials. 
  2. Inlet shall incorporate stab-fit design requiring the use of only one Type 304 stainless steel fastener. The assembly of flange or mechanical joint restrainers using multiple fasteners or wedge bolts is not permitted. 
  3. Restraint accessories shall be factory installed. 
  4. All hydrant inlets shall be the ALPHA design furnished by AMERICAN Flow Control.


  1. Friction loss not to exceed 3.8 psig at 1000 GPM through the hydrant 4-1/2 in. pumper nozzle.

Hydrants shall be the 4-½” American-Darling Mark 73-5, by AMERICAN Flow Control with ALPHA base.