I must admit, your moniker "head mistress" is well deserved. Thank-for your explaination of head odours...I just apologize that it was the 2 zillionth time you had to explain it.I was wondering if you know how the head system on my Lancer 28 works. I JUST purchased it, and don't have the luxury of being able to be on board everyday to tinker with things. it appears to be a porta-potti set up, with a holding tank under the v-berth storage. There is a "deck filler" access which, I assume, is for waste pump out where availble. I have attached a picture for you to look at, and see if something your familiar with. I would appreciate any insight that you may have.