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The relief vent is only required when both criteria apply. These circuit vents do not require a relief vent because they do not "connect to a drainage stack that receives the discharge of soil or waste from upper horizontal branches."

I too will be driving to Stevens Pass tomorrow! :) Besides gathering more measurements, I need to inspect the mountain bike trails. ‍♂️ With a little coordination, I could arrange to have your favorite cold beverage on-site. Hint. Hint. The current used-beer facilities are named Fir, Pine, and...

Look at those straight boards! They don't make 'em like that any more! I've driven the road to Alpental many times but I haven't paid enough attention to the lodges there to know which one that one is. This plumbing plan is for the Mountaineers lodge at Stevens Pass.

@John Gayewski, when using a horizontal wet vent or circuit vent (as shown), every toilet is considered vented. The top half of the horizontal pipe is the vent and up to 8 fixtures can be vented per circuit, per the UPC and the King County rules (see post above by @Tuttles Revenge). @Tuttles...

@Tuttles Revenge, great reference, and tips about meeting in the horizontal. I had questions about circuit vents that the document answered, including "The most upstream fixture should not be a fixture that is seldom used, such as a floor drain." In this case, the floor drains at the end of the...

I have read enough of the plumbing code to guess how deep the rabbit hole goes and I'm up to my eyeballs. In pre-COVID days, I'd take my DIY plans down the local AHJ, ask questions, get feedback, and then go apply pipe cement. This week I called Terry, and he suggested I post here. This...