Well, after looking in every nook & cranny, some things were found. Only found one air remittance valve on the kitchen sink. Not one one the bathroom sink. There was a Hepvo Waterless Waste valve on the washer drain hidden in the wall behind a panel under the bathroom vanity We do not use the washer hook-up so I put an air remittance valve on the washer waste water drain. Still have a slight smell in the bathroom, especially in the morning! Next move is replacing the bathroom sink P-trap with a Hepvo unit. Waiting for it to be delivered
This is the item:
https://www.amazon.com/Wavin-BV1B-UB...95483991&psc=1