I just removed the wall above the kitchen sink and replace the 1.5" pvc vent stack with a studor inside the wall behind the kitchen sink. It drains fine but makes a light thumping noise as the water drains from either the sink or the dishwasher. This same drain line has a utility sink installed in the bottom floor which also has a studor vent inside the sink cabinet but it does not make noise. All drains flow smoothly with no odor but the one behind the sink just makes noise inside the wall where the studor was installed. I'm concerned that the valve may be faulty. The wall is already capped with a bar so it would be difficult to repair inside the wall. Please advise...
Thanks
Thanks