Looking to see if I've made a mistake here. I've got an old (1920s) house that I added about 30 feet of 4 inch PVC pipe to drain two bathrooms into an existing cast iron drain that goes out to the street. The existing cast iron pipe outer diameter measures 3.3 inches (circumference= 10-3/8). Is this a "3 inch" cast iron drain pipe size?
Is it OK to be flowing from the larger 4 ID to a smaller 3 ID or am I asking for blockages here? I made the connection using a rubber sleeve (with hose clamps) that fit on the cast iron hub OD and the OD of the PVC, so the flow path gets smaller by going through the cast iron hub.
Thanks for your help.
Is it OK to be flowing from the larger 4 ID to a smaller 3 ID or am I asking for blockages here? I made the connection using a rubber sleeve (with hose clamps) that fit on the cast iron hub OD and the OD of the PVC, so the flow path gets smaller by going through the cast iron hub.
Thanks for your help.