Hayward SP1022CBLK Plug with O-Ring

Designed to use for concrete pools. Simply screw-threaded plugs into all return and drain inlets after blowing outlines. Helps prevent damage to plumbing lines due to the expansion of freezing water. Available in black color. Measures 1-1/2-inch MIP thread size. All-purpose drain plug comes with an O-ring Designed to use for concrete pools Helps prevent damage to plumbing lines due to the expansion of freezing water Available in black color Measures 1-1/2-inch MIP thread size