Features stainless steel bolts and washers and large plastic wing-nuts. #9 Winter Plug with Valve for 1-1/2 Inch Pipe and 1-3/4 Inch Fitting, with Blow Thru Valve Includes blow through fitting to assist with blowing out or winterizing pipe. The rubber expansion plugs are non-corrosive construction made of heavy-duty nylon, stainless steel, and high quality rubber. The wing nut turns easier and provides 50% greater tightness than conventional plugs. Great all around plug to assist with home plumbing needs, swimming pool winterizing, leak stopping, etc. Includes blow through fitting to assist with blowing out or winterizing pipe.