Plumbing code question: can I use PVC electrical conduit for a plumbing vent?

i wouldnt think so.but codes here differ than that of where you live.dont worry about looking foolish to the inspector,he gets alot of this sort of thing from homeowners.besides what do you care what someone thinks that you will never see again.on the other hand you could wait till he has given the okclimb in the attic cut off the last 2 feet and add a coupling and the 2 feet of grey.it just pushes through the rubber seal with little to moderate resistance.if you have a tuff time of it (i doubt you will) use vasaline lol it will not affect the rubber

Your inspector may give you a hard time about that. Try looking for Schedule 80 PVC. Schedule 80 is a little darker of a gray then the electrical conduit but your inspector should give you no hard time about it. You could also just paint the schedule 40 pipe to whatever color you wish.

No disrespect to the others that answered but PVC is very useful for water use. Well systems use PVC to go from the well to the house and Irrigation systems use PVC for most applications. Now to the type of PVC you need to use on the inside of the house is called CPVC. CPVC was created to compete with copper when it first came out. It is just as strong as copper and probably will last longer in the right conditions. It is easier to work with and the cost is much much less. You want to make sure when using CPVC you have it well insulated on any outer walls and crawl spaces because it is not freeze resistant at all. Now they have come out with some new pipes that are much better than Copper or CPVC called PEX Pipe. Pex is cheap pipe but the fitting will cost a little more than the Copper or CPVC fittings but it is much more durable and it is Freeze resistant.

The chemical code and the ASTM number, needs to match what is in your local code book.

The chemical code and ASTM number, is stamped on plumbing pipe. Never looked to see if it is on conduit but I'm sure it is.

I can assure you, the inspector, if he is any kind of inspector at all, will not pass conduit to be used as a drainage vent.

Your local code enforcement may also recognize other foundations such as ANSI and IAPMO

Under UPC code the ASTM number you will find on the pipe is ASTM 2665-94 and/or ASTM D 1785-93

The chemical code for PVC Sch 40 is 1120

Now, lets fix your appearance problem.

Code requires that PVC vent pipe that is exposed to sunlight be painted.

Most inspectors in my area do not push that.

Have your painter paint the end of the vents. That will protect your vent that is exposed to UV, and solve your appearance problem.