With a life expectancy of, say 100 years or so, why not make certain your fire hydrants are installed correctly the first time. How many times, after installation, is a hydrant still either too high or too low??

Specifying Gradelok® gives you the advantages of a restrained joint and grade adjustment in a single fitting. You’ll provide enhanced aesthetic appearance by having all fire hydrants set exactly to grade. And by specifying Gradelok® you’ll save money by eliminating expensive extension kits and concrete thrust devices. Be sure to specify Gradelok®, the system providing the very best hydrant installation available.

Without Gradelok®:

gradelok1     gradelok2  gradelok3

With Gradelok®:



Download detailed drawings:


Benefits of Having Gradelok®

  • Reduced installation costs and taxpayer budget savings are an important consideration, however… Public utility directors, politicians and taxpayers should demand the specification of Gradelok® for the public safety benefits!
  • Fire Department wrenches – approximately 15″ long need appropriate clearance from groundline to nozzle centerline of 18″ to spin the caps off quickly in an emergency.
  • At properly-installed nozzle centerline of 18″, ONE fireman can easily attach a suction hose by holding it between his knees while threading the coupling. Hydrants installed too high or low require at least TWO firefighters to hook up.
  • The 18″ distance is the most effective to enable a fire hydrant’s traffic feature to break properly upon impact. If the traffic flange is buried or set too high, chances of it breaking correctly upon impact are greatly reduced.
  • The traffic flange is always exposed, easily-inspected for damage or leakage during routine maintenance.
  • At a uniform installation height, firefighters can most-quickly identify fire hydrant locations in an emergency.
  • Gradelok® is manufactured of 350 Ductile Iron, cement-lined inside and tar-coated outside for corrosion protection, and conforms to AWWA C153/ANSI A21.53/AWWA C104/ANSI A21.4

Assured Flow Sales, Inc. warrants that all of it’s product are free of defects in material and workmanship. Assured Flow Sales, Inc. will replace at no charge any of it’s new products found to be defective within one year of the date of purchase from Assured Flow Sales, Inc. Assured Flow Sales, Inc. shall not be liable for any loss, damage or injury, direct or consequential arising out of the use of or the inability to use the product. Before using any product the user of the product shall determine the suitability of the product for it’s intended use and assumes all risk and liability. No claims for labor or consequential damage will be accepted.


Reasons for Using Gradelok pdf
Additional Information on the Gradelok system

Check out more products from Assured Flow Sales, INC

  • NIS Bags – Designed to give firefighters a quick, visible reference that a fire hydrant is temporarily out of service.
  • NIS Markers – Patented design not only is visible from the front of the hydrant but also from the sides giving advanced warning to firefighters that the hydrant is not in service.
  • Hydra-Tag System – Durable identification system is made from rust and corrosion resistant solid brass.
  • Nozzle Saver – Prevents costly damage to fire hydrant hose nozzles.
  • Hydra-Eze™ – Dependable, quality lubricant for fire hydrant hose nozzles.