DPN內螺紋接頭一端連接軟管，另一端連接于帶螺紋鋼管或裝有外螺紋連接件的設備上，訂貨時請注明軟管規格及連接螺紋尺寸。例：DPＮ15－G1/2〃，一端φ15軟管，另一端G1/2〃。
| 規格標注 | 英制螺紋G | 公制螺紋M | 美制螺紋NPT | 德制螺紋PG | |
| 公制 | 英制 | ||||
| 12 | 3/8＂ | G3/8＂ | G3/8＂ | 3/8 NPT | PG13.5 |
| 15 | 1/2＂ | G1/2＂ | G1/2＂ | 1/2 NPT | PG13.5 |
| 20 | 3/4＂ | G3/4＂ | G3/4＂ | 3/4 NPT | PG21 |
| 25 | 1＂ | G1＂ | G1＂ | 1 NPT | PG29 |
| 32 | 1/1/4＂ | G1/1/4＂ | G1/1/4＂ | 1/1/4 NPT | PG29 |
| 38 | 1/1/2＂ | G1/1/2＂ | G1/1/2＂ | 1/1/2 NPT | PG36 |
| 51 | 2＂ | G2＂ | G2＂ | 2 NPT | PG48 |
| 64 | 2/1/2＂ | G2/1/2＂ | G2/1/2＂ | 2/1/2 NPT | — |
| 75 | 3＂ | G3＂ | G3＂ | 3 NPT | — |
| 100 | 4＂ | G4＂ | G4＂ | 4 NPT | — |
| 125 | 5＂ | G5＂ | G5＂ | 5 NPT | — |
| 150 | 6＂ | G6＂ | G6＂ | 6 NPT | — |
