Unique scupper flapper assembly allows drainage at low pressure and keeps water out as you back down. Larger size allows it to be used on your boats' thru hull fittings up to 2" ID. Flexible flapper is hinged at the top to help insure complete drainage and is held in place by a heavy duty had nylon trim ring. Mounts with 4 - #8 counter sunk screws (not included).
Made in the USA!
Overall outside diameter - 3-1/4" ID of trim ring - 2-1/4" Flapper outside diameter - 2-1/8" Mounting screws 1-15/16" apart on center