Curb-O-Let Thru-the-Curb Drainage Systems

Curb-O-Let is a Bellflower, California manufacturer founded in 2004 that makes single-piece, hot-dipped galvanized steel thru-the-curb drainage systems used during sidewalk and curb construction. The drain slides between concrete forms before the pour to create a clean under-the-sidewalk drain path, preventing the misaligned pipe holes and concrete cracking that come with field-cut openings. The company remains active and its products stay in line as a construction-standard part. These are construction and infrastructure drainage products rather than hydraulic equipment, so Northern Hydraulics does not stock them; what we supply is cross-reference research to confirm the right Curb-O-Let model or a comparable drainage fitting for your project.

Cross-Referencing Curb-O-Let Parts

If you have a Curb-O-Let part number from an old spec sheet, a discontinued drawing, or a contractor’s bill of materials and you need to confirm what it is or find a comparable drainage component, send it to us. Curb-O-Let identifies its thru-the-curb drains by TCD part numbers tied to curb height, so matching the correct model is a matter of reading the number against curb dimension rather than guessing at a generic replacement.

Curb-O-Let does not publish documented direct part swaps, and the galvanized-steel single-piece design is materially different from rotomolded plastic curb drains such as the Granger Plastics Curb Drain, so those are not a straight interchange. Curb and trench drainage systems from NDS, ACO, and Zurn cover similar applications but are not direct drop-in equivalents either. We will research the part you hand us, flag where a true equivalent exists versus where only a comparable alternative does, and tell you plainly when the original Curb-O-Let model is still the standard call. Send your Curb-O-Let part number or spec and request a cross-reference quote.

Curb-O-Let Product Lines & Series

Curb-O-Let builds its thru-the-curb drains around documented TCD part families sized to curb height:

• TCD317 – 6-inch curb thru-the-curb drain
• TCD327 – 6-inch curb thru-the-curb drain
• TCD414 – 8-inch curb thru-the-curb drain
• TCD422 – 8-inch curb thru-the-curb drain

The range also covers the Curb-O-Let Standard, Slotted, and Perforated models plus drainage fittings and adapters. If you are working from a TCD number on a plan set or submittal, that number maps directly to curb dimension, which makes confirming the right unit straightforward. Have a number you cannot place? Send it over for a cross-reference.