ACO Drain 99903 Type 600 Plastic Catch Basin Base (for K1-621 / K1-631)

Product Details: ACO Drain 99903 Type 600 Plastic Catch Basin Base (for K1-621 / K1-631)

A complete ACO KlassikDrain installation is more than channel and grate. The K100 (galvanized edge rail) and KS100 (stainless steel edge rail) systems are modular polymer concrete trench drains with a 4" (100 mm) internal width, engineered for commercial and industrial stormwater duty — and ACO backs the line with a full range of factory accessories that make each run easier to install, maintain, and keep in service. From trash buckets, bases, top sections, and risers for the Type 900 in-line and Series 600 catch basins, to locking bars, debris strainers, outlet adapters, installation devices, and Brickslot access spares, every accessory is a genuine ACO Drain part with its own ACO part number, made to fit its matching KlassikDrain component exactly. Selecting the correct part keeps the system performing the way ACO designed it — with grates that release for uninterrupted access to the trench for maintenance.

ACO Type 600 plastic catch basin base part 99903 is the LLDPE base used with K1-621 and K1-631 Series 600 assemblies. It fits the 12"-wide footprint and measures approximately 15.87" to 15.91" (403 to 404 mm) across the outlet stubs. Schedule 40 cut-outs support 4", 6", and 8" outlets. The same base is also used with K200 and K300 Series 600 basins.

Quick Look

• ACO Part Number: 99903
• Material: Molded LLDPE Plastic
• Dimensions: Fits the 12"-wide Series 600 footprint; approximately 15.87"-15.91" (403-404 mm) across outlet stubs
• Compatibility: K1-621 and K1-631; also used with K200 and K300 Series 600 basins
• Schedule 40 cut-outs for 4", 6", and 8" outlet connections
• Genuine ACO Drain factory accessory for the ACO KlassikDrain 100 series — the K100 (galvanized edge rail) and KS100 (stainless steel edge rail) 4" (100 mm) trench drain systems
• Every accessory carries its own ACO part number and is matched to specific components — confirm the catch basin series (Type 900 in-line vs. Series 600), channel configuration, or Brickslot unit it serves before ordering
• Complements the modular ACO KlassikDrain K100/KS100 polymer concrete channel system: 4" (100 mm) internal clear width, manufactured to EN 1433 standards, with system load ratings up to Class E depending on the grate fitted
• Sold individually as installation aids, service parts, and factory replacement spares for new and existing KlassikDrain installations

Shop the complete ACO KlassikDrain K100 trench drain line