engagement the connecting wall 138 joins the upper wall 134 and the lower wall 136 so that the post 84 is disposed between the connecting wall 138 and the grate 36 thereby ensuring a sturdy connection with reference to fig1 12 an alternate bracket is shown as a clip 146 the clip 146 can include an upper wall 148 and a lower wall 152 a partition wall 154 joins the upper wall 148 and the lower wall 152 together so that the partition wall 154 is disposed between the post 84 and the grate 36 the upper wall 148 can also include a post aperture 156 for receipt of the post 84 further still a post boss 158 can extend from the lower wall 152 toward the upper wall 148 so as to be in registry with the post aperture 156 for engagement with the second end of the post 84 the post boss 158 provides additional stability to the connection between the post 84 and the clip 146 the clip 146 can also include a retention projection 162 with an x shaped cross section the retention projection 162 extends from the upper wall 148 toward the lower wall 152 and is received in the drain holes 68 of the grate 36 the x shaped cross section of the retention projection 162 helps to minimize weight and material cost for the clip 146 while still providing sufficient engagement between the clip 146 and the grate 36 with reference to fig1 16 an alternate containment system 164 is shown the.