I have removed a shower and the drain for it from the line main. It had been between a full bathroom, laundry room and my kitchen. I easily meet the venting needed for the remaining fixtures on the line. My question is, if I just cap off the old vent inside the wall for the removed shower could that cause me problems? Will leaving it help at all with the drainage of the line in general? I can go either way. I was concerned if it was capped off, it might collect material and create a stoppage down the road. Thanks