High-quality materialsThe bottle cap is made of high-quality materials, and the winter caps on the ground and ground swimming pools in winter are corrosion resistant and have good durability and stability . Easy installationUniversal external threaded plug, threaded connection, easy to install and use, directly replace the old or broken one. Strong sealingThis threaded plug oil return is equipped with a rubber ring, which has a strong seal and will not damage the oil return pipe due to leakage. WorkmanshipThis drain plug of filter has fine workmanship, smooth surface, wear resistance, aging resistance, long service life, and can withstand extremely cold temperatures without slipping or shrinking. Multi Use -scenes This winter socket is suitable for , pool and spa accessories.