As far as the drain water, I just have a big pan that stays under the tank. It catches most of the spray and it just evaporates off. Some of it splashes out, but it hasn't presented that big of a problem yet. Of course we don't use it all day every day. As far as a supplier for those, just about any commercial truck acsessory/supply/parts store will have them. I just get a generic valve with male 1/4" NPT and it screws right in.