General description Protect your swimming pool and spa with this pack of 5 swimming pool winter plugs. Designed to block the water return pipe, these plugs prevent rainwater from entering and causing damage to your pipeline during winterization. Each plug features a rubber O-ring to ensure a tight seal, making them suitable for various applications including massage bathtubs, swimming pools, and spas. Technical specifications Size: 1 1/2 inch threaded Material: Plastic Includes: 5 winterization plugs Installation Directly block the pipe return port without the need for additional fasteners. Simple operation takes only a few minutes. Usage Ideal for home garden swimming pools and spas. Can be used to seal skimmers, return pipes, and detergent pipes.