4" Plastic trench drain (BASE 100P), galvanized grate "perforated" ADA/Heel Proof, A ClassVodalands 4 plastic trench drain (BASE 100P) has a 4 internal width (6 external), and a length of 3. 28ft (1 meter). Customers can choose between a 1% pre slope or a non sloped system. The pre slope systems come in multi channel bundles up to your required length (maximum 13 meter lengths). The non slope systems are sold per unit but can be connected together to create a system with whichever length you require. In addition, pre slope and no slope