Support/FAQ

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PRO-RING

• Q. What is the difference between a Grade Ring and Finish Ring?

  A Grade Ring has grooves on the underside and a tongue on the upper side to form a tongue and groove joint between multiple Grade Rings and Finish Rings. A manhole frame should never be installed on a Grade Ring.  Finish Rings have grooves on the underside and are mostly flat on top with a groove located on the inside diameter which is there to accept and lock in an Angle Ring if used.

• Q. Can the PRO-RING’s be vacuum tested and if so, how long should you wait before conducting the testing?

  PRO-RING’s may be vacuum tested and the test should not be performed until after the adhesive has been cured for a minimum of 24 hours.  Any vacuum testing that is conducted should be done in accordance with ASTM C-1244, “Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test Prior to Backfill.

• Q. Are PRO-RING’s rated for traffic applications?

  Yes.  PRO-RING’s have been tested to meet or exceed the requirements of AASHTO M-306, HS-20 and HS-25 loading.

• Q. Is there a minimum temperature at which the M-1 Adhesive may be used?

  The recommended application temperature for the M-1 Adhesive is 32º Fahrenheit, however is kept warm until ready for use, we have applied the material down as low as 15º Fahrenheit.

• Q. Are there any substitutes or alternatives for the M-1 Adhesive?

  There are other materials that may work, however all of our testing related to vacuum testing and exfiltration testing has been performed using the M-1 Adhesive.  Please contact us or your local representative regarding possible substitutions.

X-85 External Chimney Seal

• Q. Are there any special tools required to tighten the bands on the X-85 External Chimney Seal?

  A large flat blade screwdriver, 5/16” nut driver or cordless impact or drill with a 5/16” socket is all that is needed to tighten the bands on the X-85 seal.

• Q. Can the X-85 External Chimney Seal be left above ground exposed to sunlight?

  Yes.  The EPDM rubber used to manufacture the seal is UV resistant and may be left exposed to the elements.