Inserting a WYE into existing underground 3"ABS drain

[newanimal]

I want to insert a 3" abs wye into the existing underground 3" abs main drain pipe for new toilet/sink/shower above (side of house). Appreciate any advice for the proper way and best fittings to use. Thanks

 

[breplum]

One way is to make up the new 3 inch ABS wye with stubs glued into each end, Then use no hub couplings. Alternative is to use a no hub wye And the appropriate ABS x no hub couplings. But frankly if you didn’t know that then you have no business plumbing to future fixtures in the first place

 

[newanimal]

I knew that. I was just testing this forum. Thanks!