| Do | Outside diameter of tee header |
| mm |
| T | Wall thickness of tee header |
| mm |
| Tb | Wall thickness of tee branch |
| mm |
| do | Outside diameter of tee branch |
| mm |
| dbo | Outside diameter of attached branch pipe |
| mm |
| rc | Tee crotch radius minimum: rc ≥ 0.125 dbo |
| mm |
| Tp | Nominal wall thickness of attached header pipe (Note 1) |
| mm |
| Tc | Tee crotch thickness minimum: Tc ≥ 1.5 Tp |
| mm |
