The Zurn Z874-21 is a heavy-capacity exterior trench drainage solution designed for large-scale surface runoff applications. Its 21″ wide throat accommodates high flow volumes, making it ideal for plazas, parking decks, entryways, and other expansive paved areas. The system features a built-in slope for efficient water evacuation and is engineered for durable performance in outdoor environments.

Key Features

• 21″ wide throat (approximately 26¼″ overall channel width) designed for high-volume drainage.

• Pre-sloped channel (1.00% or similar) ensures self-clearing flow and minimizes standing water.

• Durable construction with heavy-duty frame and grate system rated for dynamic loads and vehicular traffic.

• Modular design with interlocking channel sections and installation aids (e.g., clips, anchor tabs) for rapid installation in concrete pours.

• Wide accessory and configuration options, including multiple outlet sizes, end-caps, and optional material finishes for customization.

Note: Zurn trench drain products are subject to a $750 minimum order.

Downloads:

• Specification Sheet - Z874-21
• Spec-Tran Brochure
• Features
• Specified Transportation Systems Flyer
• Specified Commercial Systems Brochure
• 25-1_2_ Wide Grates
• Installation Instructions - Z874
• Product Definitions and Weight Classification Guide