I live in a 60 year old house in Baytown, TX. The house was built by the previous owner who looks like he did things his own way and was happy about it. Here is my problem. I am updating the bathroom, taking out the cast iron tub and installing a 48" shower stall. I am going to have to move the drain location since it is not in the correct place for the shower. I have excavated the area, broke up some concrete and have found this. The tub drain is cast iron and apparently the end of the drain line. There is no P Trap visible and about 8" from the drain end is a vent tube. I am wanting to move this vent since it is in my way but what I am wanting to know is why is this vent tube here? The only thing I can figure is because when the water flows from the tub drain and passes the vent tube it allows for air to be taken in and lets the water move. Would I be correct in assuming this? Also... is it necessary?
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