Automatic coupling installation uses a coupling device to connect the pump and pipeline. With the coupling device, the pump and the water outlet pipeline are independent and do not need to be associated with conventional fasteners, making it very easy to connect and disconnect the pump from the water outlet pipeline. The coupling device only consists of four things: outlet pipe seat, guide rod, guide rod frame, and coupling frame. The guide rod only plays a guiding role and is not subject to force. It can be made of ordinary water pipes or steel pipes. The user can prepare it by himself, and it can be easily cut to the required length according to the depth of the pool. When installing, put the outlet pipe seat, and guide rod, After the guide rod frame is installed, put the coupling frame Install it on the pump body, lift the pump, insert the semicircular hole on the coupling frame into the guide rod, slide the pump down along the guide rod to the bottom, the coupling frame will fasten the pump body and the outlet pipe seat, and at the same time, the pump body outlet and The inlet of the outlet pipe seat is automatically aligned, and the flange end face is also automatically attached. When the pump needs to be repaired, lift the pump upwards and the pump body and outlet pipe seat will be detached. Therefore, this installation method has the advantages of saving worry, effort, and trouble. Since the coupling device and the pump are relatively independent, if the user's pump station needs to switch to a low-lift or high-lift pump of the same caliber due to changes in conditions, the original coupling device can still be used.