Pool Wall Return Drain Plug 1 1/2" mpt w/O-Ring, Winterize Plug

This part is a 1 1/2" MPT Threaded plug that is used in Swimming Pools to block off the 1 1/2" Threaded returns when winterizing to stop water from being in the plumbing system and used on some Sand or De Hayward filter systems. You would simply unscrew the existing eyeball or other style of pool wall jet and screw this plug into place. This plug does come with an o-ring to seal the fitting.