Part # NW310
Dimensions 2-1/8" X 1-3/16
Alternate Part #'s APC1022C
After adding antifreeze to the lines, use these threaded plugs in all skimmer and return lines for winter protection. Our plugs fit 1-1/2" threaded pipes.
Click here for more Pool Winterizing
Note: Currently shipping black plugs and not white as shown in the photo. Everything else is the same with exception of color.
Would I need this item for an above ground pool?
Yes we would suggest this for an above ground pool, here is a great document which shows the step by step process of closing your pool along with the particular items you would require http://www.inyopools.com/winterizing_answers.aspx