This is an odd arrangement in a 110 year old home that went through a period of foreclosure, neglect, squatters, and who knows what else. I'd appreciate your advice on what needs to be done with this sewer pipe problem Top to bottom, the first problem is a disconnected pipe. There's a pipe going up (to god only knows where) and a pipe connecting to a lateral that immediately joins the main stack. Both are open, exposed to air. I've never seen any water come out of either pipe. I'm thinking of just capping them off. The second issue is an open pipe, attached to the main stack, that I'd like to use as a clothes washer drain. I know I'd need to extend the putative pipe up above the height of the washer and put an S trap in there somehow, but I don't know about venting requirements. I'm attaching a crude ms-paint diagram so you have a clearer understanding of what's up. Thanks in advance for any advice or instruction you can offer.