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I have read that using galvanized metal strapping to support ABS drain/vent is at best unprofessional, and at worst against code. Unfortunately, alternatives seem to be lacking. Plastic J-hooks seem to only be available at professional plumbing suppliers. The big boxes sell nothing but...

Installing a toilet in a joist bay, so space is limited. I would ideally use a spigot closet bend (like this: https://www.homedepot.com/p/4-in-x-3-in-ABS-DWV-90-Degree-Spigot-x-Hub-Closet-Elbow-C58072CLHD43/100343148) , cut down to level, and add a 4" hub flange. Unfortunately, up in Canada...

I'm doing an ABS to cast transition. 4" cast connected to a 4" to 3" ABS bushing. The bushing has a spigot end that should be identical diameter to 4" ABS pipe, so I figured a regular hubless 4" shielded coupling would work. (I used this one: https://www.americanvalve.com/product/rnhhd/)...

I am designing a new bathroom + kitchen sink on a second story. Will need to tie everything into the 4" stack. Could you take a look and let me know if my idea makes sense? There a section of "wet" vent, where I have a kitchen sink draining above where the toilet discharges. Is that okay...