So im going non sequential and of course I need a cast iron pipe plug 3/8 and can't find one. i've searched the net...google...called major companies across the states...local automotive shops...plumbing stores...and even ace hardware which some said do carry cast iron pipe plugs but when I even called the online store they couldn't find anything in their inventory they said if I can give them an id number they may be able to look it up but otherwise i've had no luck anywhere. Please help direct me to where I can find one please and if you have the part number or sku so i can have the store look it up! Thank you and I need all the help I can get