Update on my problem: I hosed down my combo black/gray water roof vent today and now can smell the black tank - success! The best news: I think the Siphon 360 Vent is working now that the black tank vent is fully open. Almost no smell at all - excellent! Thanks to Stacey for the reminder to do it. I remember shining my powerful flashlight down the vent tube and it looked clear from what I could see, but apparently there was some obstruction further down. The powerful, rushing water stream opened it back up.
I now can recommend the Siphon 360 Vent as a possible cure for RV bathroom smell.
Many thanks to all,
Lew in Texas
2008 DRV 36TK3
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