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I've only ever used regular wax ring. But I see at H.D. that there are ones with a plastic funnel. What is the purpose of the funnel? Is it really necessary to funnel waste into the drain pipe?

I see it as more of a bottle neck...turning what would be 4" drain into something like 2".
 

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been using them for years-never a problem. But there are some who wont use them, i guess it's a matter of preference.
 

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They work well--most also have a foam core which is a tiny bit more forgiving than a solid ring.

Try one--they have been the standard for quite a few years.
 
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