| Product Type: | Tee |
|---|---|
| Vent Type: | Non-Condensing |
| Height: | 7.9" |
| Size: | 4" |
| Diameter (Inches): | 4" |
| Installation Type: | Vertical |
| Used With: | T-K4-IN T-M32-ASME T-KJr2-IN T-D2-IN T-M32 |

The threads are just leftover from the manufacturing process, you would install standard drain tube connected with a hose clamp over the fitting.
The tee will accommodate a standard 1/2" ID drain tube.
This piece is single wall Cat III stainless.
Usually it will not, depends on the application.
Yes, it is.