Am I plumbing this laundry drain in an odd way?

[Canada_DIY_Plumber]

I'm buying my drain pieces for a new laundry connection. My plan was to make the drain/trap 2" (all the way from the laundry box to where it enters the main 4" horizontal drain under the slab.) I was going to set up a dry vent (to connect in the attic with an existing vent) using 1.5"
I expected this to be a fairly common situation and figured the plumbing store would have a sanitary tee that is 2" on the side, 2" on the bottom and 1.5" (for the vent) on the top. However, I can't find that anywhere.
Now of course, I can just buy a 2/2/2 san-tee and put a 2"->1.5" reducer at the top for the vent pipe (I can do that, right?) but it got me thinking: Am I doing something odd here? If this was a common way to set up a laundry, wouldn't it be easier to find this part?

 

[wwhitney]

0) (Yes, no problem.)
1) No, nothing odd.
2) Apparently not.

Cheers, Wayne

 

[Sponsor]

 

[Terry]

The 2 x 1.5 x 2 santee is very common when plumbing for a dishwasher.

 

[Mr tee]

I think Terry meant clothes washer. That is a common fitting.

 

[Canada_DIY_Plumber]

Thanks all. Sounds great. Sometimes parts are hard to come by in smaller towns in Canada but was starting to wonder if I was doing something wrong.

 

[Jeff H Young]

common fitting yes. but less common than all others. your just not lucky canada Diy plumber. the bushing is fine no big deal or run a 2 inch vent. your not gaining anything but If I got the material and save a trip for one silly part sure .