Heavy Duty Trench Frames with Grated or Solid Covers

 All frames and grates are furnished standard in Gray Iron, Class 35, for heavy duty use.

For extra heavy duty use, R 4990 for Airport Trenches.

We recommend project designers avoid the use of light duty trench installations

because it is likely that applications will be subjected to heavy delivery

vehicle traffic at some time.  Furthermore, the use of a site could be changed

 to heavy duty use patterns at some unanticipated future date.