16x16 Plastic catch basin (BASE 400-CBP), stainless fillable slot, C ClassVodaland's 16x16 BASE plastic catch basin is a square basin with a 16" width, 16" length, and 21" height. This catch basin comes with a C class stainless steel fillable slot. The C load class is designed to withstand vehicle traffic. This basin has pipe connection outlets in diameters of (3" 8") on all four sides. Each basin can be purchased with an optional galvanized steel debris basket so that all debris and sediment is separated from the liquid