yes, there is. It may not be very common though.

You might be better off just using a 1 " tee and then using 1x 3/4" bushings in order to do the same thing. Those parts are all available at your local hardware store.

http://www.homedepot.com/p/3-4-in-x-3-4-in-x-1-in-Copper-Pressure-Tee-C611/100344605

Hey! There's that other Wiegand!

I think the OP was looking for PVC. I found similar listings for it in PVC - but like the copper fitting, it was all special order. The 1" Tee and bushings are the way to go if you can't wait around.

Thanks for the help... Found it: https://www.plumbingsupply.com/pvc-by-size.html#075

Oops, missed the PVC.

Seems like the sort of thing a real plumbing supply should have in any event, But yes, a couple adapters will work just fine.