We demonstrate task level pipelining on multiple accelerators with PEACH2. PEACH2 is implmented on FPGA, and enables ultra low latency direct communication among multiple accelerators over computational nodes. By installing PEACH2, typical high performance computation nodes are tightly coupled. In this environment, application can be accelerated by exploiting not only data level parallelism, but also task level pipelined operation. Furthermore, we can processe multiple task on multiple accelerators in a pipelined manner. In our demonstration, application achieves 44% speed up compared to a single GPU.