Description: Effective protection of swimming poolsThe winterizing pool plugs can clog the drains or pipes of swimming pools to prevent water from flowing into the pipes in winter and freezing them, which will damage the system. pool drain.Protects nozzles and drain holes from freezing. High Quality MaterialsThe pool winterizing plug is made of high quality rubber and stainless steel wing nuts. Strong and durable, it resists corrosion and rust. No pungent smell. Easy to installThe pool inlet nozzle rubber stopper is 38mm in diameter and easy to install. All you have to do is determine the diameter of your swimming pool water pipe, then buy our winterizing plug for swimming pools and plug the drain. It is a very practical accessory for the wintering of swimming pools. Widely usedThe winter plug for swimming pools is versatile, it can be used not only to block the water pipes of the swimming pool, but also to plug the water return pipes in winter to prevent water from entering the pipes during the winter months. It is also suitable for pressure testing or pool pipe maintenance. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.