12x12 Plastic catch basin (BASE 300-CBP), plastic grate, A ClassVodaland's 12x12 BASE plastic catch basin is a square basin with a 12" width, length, and height. This catch basin comes with an A class plastic grate with a mesh design. The A load class is designed to withstand pedestrian traffic. This basin can be connected to our 4 Base plastic trench drain when used with a riser, and has pipe connection outlets in diameters of 2, 3, 4, and 6 on all four sides. Each basin features an internal debris basket and