BCConstruction said:Just use the oatey test plugs in 3" or 4" they ain't expensive about $5 each but they will last forever.
This is an easy one. You get your helper some party balloons and have him put one in his mouth, then get his face right down there in the wax and start blowing up the balloon. Once it's full, he can just tie it off.
MIKE ANTONETTI said:Yes I am aware of the flaring of the rubber seal as the backer plate raises toward top of cap compressing against pipe. The 3" fit down into pipe (the whole thing ) the 4" wouldn't go into the 3-1/2" opening and can't attach to the bevel. I didn't want to waste(pun) time creating a 2 second fix that the caps will provide .