Ⅰ. The anti-freeze plug can block the water return pipe, prevent rainwater from entering, freezing and bursting the pipe, and protect the pool from damage. Ⅱ. The swimming pool winter plugs ensure water resistance, the 5-piece winter plugs can meet your various needs, suitable for hot tub accessories, swimming pool accessories, spa pool accessories. Ⅲ. Easy to install and use. Ⅳ. The pool drain plug directly blocks the pipe outlet, without requiring additional fasteners, and can be easily used for swimming pools in just a few minutes. Ⅴ. Rubber winter plugs are suitable for garden pools, swimming pools, etc. Winter Pool Plugs can be used as pipe plugs to seal waste water drain lines, return lines and cleaning agent lines. Ⅵ. The expansion plug is made of plastic, meets standard specifications and is retractable to ensure high sealing efficiency. Tight and prevents leaks. Ⅶ. Product type: winter cap Ⅷ. Material: plastic + rubber ring Ⅸ. Color: white Ⅹ. Product dimensions: approx. 5.5 x 3.3 cm / 2.2 x 1.3 inches (L x H) Ⅺ. Cable size: approx. 4.8 cm (1.9 inches) Ⅻ. Inner diameter: 3.81 cm / 1.5 inches ⅩⅢ. Weight: approx. 107 g / 3.8 ounces ⅩⅣ. Application: for hot springs, swimming pools, spas ⅩⅤ. Function: protect the pipeline ⅩⅥ. Package contents: 5 winter pool caps