Hi, long time lurker here. I like browsing this form, it's got the bunch of people that seem to like plumbing as much as I do haha. I just moved to Ontario from Vancouver and I left my code book at home. I'm a 2nd year apprentice and I was wondering if I could connect 4x90 elbows back to back on a wet vent so it formed a -u- looking piece. It's offset enough to provide grade but I want to know if I need to go back to fix it. I asked my employer but he hasn't gotten back to me.