Advanced Drainage Systems Inc. 321AA Tee Fitting

3-inch Tee Fitting for Drainage Systems

This 3-inch tee fitting connects three sections of corrugated pipe in drainage and waste-management layouts. It is made from polyethylene plastic that resists acids, alkalis and freezing temperatures without breaking or crushing. The lightweight material makes handling and positioning straightforward on site. Builders and DIY users working on residential or light-commercial drainage projects will find it suited to standard 3-inch corrugated pipe runs.

Integrates with Corrugated Pipe Networks

The fitting joins directly to 3-inch corrugated polyethylene pipe, completing a branch or junction without additional adapters. Its corrosion-resistant body eliminates the need for protective coatings or metal hardware that can degrade in wet, chemical-prone ground. By using a single moulded piece, it reduces the number of separate components a crew must carry and assemble. The design frees installers from threading or gluing steps required by rigid alternatives.

Maintains Shape Under Ground Pressure &&

The polyethylene construction absorbs soil movement and surface loads without cracking, preserving flow paths through seasonal freeze-thaw cycles. Chemical resistance prevents wall thinning when exposed to alkaline or acidic runoff over extended periods. Because the material does not become brittle in cold conditions, the fitting retains its structural integrity during winter installations and long-term burial. Sustained performance relies on the inherent toughness of the plastic rather than on added reinforcement.