The freeze protection plugs are designed to seal your plumbing lines against freezing.
The plugs feature stainless steel washers with brass slotted screws.
An easy-to-turn reinforced handle (Easy Grip shown) helps to provide a tighter seal than ordinary plugs. Simply insert the plug into the pipe and turn the handle. This motion causes the plug to expand in the pipe creating a tight fit that will keep water out of the plumbing.
Find the size you need by the chart below-