Designed specifically to raise INDOT Type 15 castings, the 46" x 30" PRO-RING inlet shim is a durable and lightweight solution for raising the height of castings. These risers are made of expanded polypropylene, which is high strength and 1/20th the weight of typical concrete grade rings. This makes them easier to install, less prone to damage during transportation, and able to absorb shock/energy better than rubber shims. 
 
PRO-RINGs meet INDOT standards and AASHTO HS-25 load requirements. They will not be damaged or compromised if in direct contact with up to 285 degree hot-mix asphalt. They allow for adjustments to within 1/4" of desired elevation with no height stacking limitations. M-1 Adhesive is the recommended sealant for PRO-RING installation. 
 
For additional PRO-RING sizes and information about our current stock, visit our PRO-RING Inlet Shim information page. 
 
The 46" x 30" ID PRO-RING Inlet Shim is available for same-day pickup in 1", 1-1/2", and 2" rises or a 1" - 2" angled rise on either the short or long side. Call ahead to confirm availability.