310 Type "C" Inlet-24"

Underground precast drainage inlets are among the most widely used drainage products in the market today to collect excess storm water runoff from roofs, sidewalks, parking lots, and paved streets. Drainage Inlets can be categorized as Curb Inlets, Drop Inlets, and Area Inlets depending on the application. Oldcastle Precast inlets are engineered to resist corrosive elements and withstand volumes of water inside as well as extreme loading conditions outside. Our inlets are manufactured in a wide range of sizes to meet all state and local standards. A variety of custom options are available including: knock outs, block outs, frames, covers as well as risers to best fit your project needs.


  • Modular Construction
  • Base/Bottom Section
  • Knock-outs and Block-outs
  • Riser Sections
  • Top Sections
  • Frames and Grates
  • Rings and Covers


  • Offers rugged durability for optimal drainage and access to vital connections; Customizable sectional design; Quick and easy install
  • Five-sided durable construction with openings for pipe connection points; Available with a flat top or joint key way for increased watertight performance; Variety of sizes available
  • Available in multiple locations to accommodate various connection sizes and elevations; Round or rectangular shapes available per design specifications; Knock-outs are easily broken with a hammer for a desired fit
  • Elevate access to accommodate for varied depths; Variety of sizes available
  • Area or grate inlet design type options:= Frame and grate access= Concrete slab top with manhole access= Five-sided with block-outs= Optional rebar dowels; Curb inlet top sections install flush with curbsides to allow stormwater to flow into the underground system= Available with grate access or manhole ring and cover access
  • Our frames and grates prevent debris from entering a storm water management system; Grid configuration grates or series of bars grates available; Material: galvanized metal or cast iron; Wide variety of custom and standard sizes available
  • Maintenance and inspection accessibility; Variety of sizes available; Available covers include: manhole frames with cast or ductile iron covers
  • Meets the following criteria:= ASTM C 478 specifications= AASHTO HS-20 live load criteria= NPCA & ACPA certifications

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