The product includes 2 pcs rubber plugs and 2 pcs white threaded pool return pipe plugs. The expanding rubber plugs not only return and clean the water pipes and keep the water from entering the pipes by making them flow back in winter; they can also be used to test the pool pressure and prevent water from flowing out of the pool during equipment maintenance. Threaded pool return pipe plugs can protect the pipe from breaking in winter. The pool winter plugs are made of high quality rubber material which is and reusable, sturdy and safe; made of high quality metal which makes it less likely to break and rust. Threaded pool return line plugs p.lugs are made of high quality material that can withstand very low temperatures without slipping or shrinking, and you can use these plugs outside for a long time. Easy to use: Just screw the swimming pool rubber plug to the return and drain ports after the water is drained to prevent water from entering the pipe. Winter swimming plugs are widely