Reliable material: pool winter expansion plugs are made of durable rubber material with screws and stainless steel screw bolts, durable and stable, not easy to break or rust, can serve you for a long time, and this threaded pool return line plug is made of quality plastic material to resist cold temperatures without slipping or shrinking.Practical and useful : these pool rubber plugs are designed to plug your swimming pool pipes after they have been drained to prevent water from entering the pipes and causing freeze, and threaded pool return line plug can helps to prevent break to plumbing lines due to the expansion of freezing water.Convenient to : just screw this rubber plug into all return and drain inlets after blowing out lines, with proper dimension, convenient to handle and , won take you much time and effort, also can match with 1.5 inch threaded pool return line plug to create a using effect.Wide range of usage: these swimming pool winter expansion plugs could be applied as a pipe plug to plug the skimming device, return pipe and cleaning pipe to prevent water from entering the pipe in winter and causing corrosion inside the pipe, and they also can stop water from the pool when repair, also threaded pool return line plug is good for winterizing plug for above-ground and in-ground pools during winter season.Colour:White+BlackMaterial:Plastic + RubberPackage Contents:1 x drain plug1 x compression plugOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.