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Does your sink drain into the black tank or grey tank? Some of us with 04's have it draining into the black tank. If the p trap under the sink is allowed to dry out, then the smell can come into the rig. Also check that the vent cap is not blocked. We have not had a problem with smell even though the sink drains into the black tank, but we live in it full time and so the P trap never goes dry.
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