等于三通（CxCxC）
| ASME B16.22 | EN1254-1 |
| T1/4 | L6 |
| T5/16 | L8 |
| T3/8 | L10 |
T1/2 | L12 |
| T5/8 | L15 |
| T3/4 | L18 |
| T7/8 | L22 |
| T1 | L25 |
| T1 1/8 | L28 |
| T1 1/4 | L32 |
| T1 3/8 | L35 |
| T1 1/2 | L38 |
| T1 5/8 | L42 |
| T1 3/4 | L45 |
| T2 | L50 |
| T2 1/8 | L54 |
| T2 5/8 | L67 |
| T3 | L76 |
| T3 5/8 | L92 |
| T4 1/8 | L105 |
| T5 1/8 | L130 |
| T6 1/8 | L155 |
