Ok here's my situation. replaced all the subfloor under the toilet in bathroom. Put down new linoleum. The pipe coming up through the floor is a 3" lead pipe. So I go buy a PVC $4 closet flange that fits down INSIDE the lead pipe. It doesn't have the gasket thing on it that you tighten with the screws. So I put the flange down inside the pipe, its a nice snug fit and actually would not go down 100% on one side by hand. Well when I put the 4 screws down in it and screw it to the subfloor it becomes snug to the floor. Also had bought a Jumbo wax ring that has the plastic horn thing on the end. Well, this horn will NOT go down inside that PVC closet flange..its too big. So I say screw that thing, I just go buy a standard wax ring. Adhere it to the horn on the bottom of toilet and secure toilet to the floor. Toilet is nice and secure and snug to the floor. There was a decent amount of tension there from the wax so I had to wiggle the toilet and what not to push it down flush to the floor..a good sign I'm assuming telling me there's enough wax. Ok...I flush it..bad leak underneath the toilet. Something obviously isn't right. I don't know where I went wrong ?? Now before putting that last wax ring on I did take the toilet and sit it down over that flange with no wax to make sure everything was ok and the toilet did sit flush with the floor when I did that.