Seattle Basement Bath: Smart UPC DWV Plan (plumbing101.i234.me) Question I’m renovating a surprise basement bathroom in Seattle. All drains are under the slab and tie into the kitchen stack. I drew a plan, but I worry about the slope and the horizontal vent. Specifics: Where should the end-of-line cleanout go? Can I use a Fernco… Continue reading Seattle Basement Bath: Smart UPC DWV Plan