Plumbing – What type of floor drain is this and can I connect pipes to it

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Everything is fine with the drain, however there was some gunk left on this picture because no one used it for years and I was cleaning it up when I took the picture, here is my floor drain which was closed off with a cap:

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I can't see what exactly happens, but first off this black plastic is not removable – it might be stuck with concrete in the floor. Anyways, the whole idea with this drain is that it's not going straight down to the sewer. First there is water that is always stuck in the larger basin, which drains into the smaller hole which ends up to a flat surface with a small circular 360* open, which then it might (I suppose) continue to the normal pipe, I draw a section view what I think happens here:

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So what type of drain floor is this and can I connect bathtub drain pipes to it (although it is already narrow, short and I cannot use reducer).

Best Answer

enter image description here It is not made for more pipes, it is a floor drain and the only way to hook more pipes t it is to break up the floor and tie into 3" line that drain does eventually tie into.

This picture of the drain cap I was referring t. It is like the older cast iron type. Looking up this type of drain that is around now have openings all over it.

enter image description here The way it is supposed to work is, the water is not supposed to go directly into the drain in the center. It fills the "cup" around the perimeter, catching any objects that get washed in by the flow of water. The objects will settle in the bottom of the catch basin and the water will fill up enough to pour over the edge and go down the waste pipe in the center.

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