Wide range of application: 1.5 inch pool plug is a winter expansion plug which has wide range of application, suitable for pool return line in winter, also suitable for most types of return line winter filter. Reliable to use: this winter expansion plug with ring is made of quality plastic material, which is reliable, and can withstand cold temperatures without corrosion and fade. Practical and useful: each plug is equipped with ring to the seal between the cap of plug and the hose to avoid freezing in winter. Colour:white+black Material:ABS Package Contents: 4 x drain plugs Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.