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Discussion Starter #1
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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You would probably smell sewer gas if there wasn't a trap- is there a drum trap where the tub tied in? Can't tell from the picture- but thats an odd looking fitting. Bear in mind a shower takes a 2" drain.
 

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Roofmaster
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Looks like its time for a sawsall and a right angle grinder with a metal cut off blade. Get all that old munged up pipe out of there now, or you will be one sorry puppy, my friend.
 

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Discussion Starter #4
The only part that was taken before the picture was taken was the drain part for the tub. After further digging I have found that where the vent goes in that it continues down from there and I have not found a 90 or anything else. I am down about 14" from floor level. I am thinking about taking the vent tube and the fitting attached to it, switch to PCV, make a 90 and position my vent tube where I want and then come off of there and put my drain where it is needed. Basically keeping the same configuration but moving it around some. I had a pipe collapse 3 years ago in the kitchen and re-routed my main line for the kitchen around the back of the house and tied back in at the front of the house. During that installation I did install a 45° fitting in case I needed it in later years outside the bathroom window. I am hoping I do not need it.
 
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