Connecting one end and joining the hose with tooth type in DPN, another end is joined on the threaded steel tube or the equipment equipped with the other whorl attachment , whether order please indicate hose specification and connect whorl size, example. DPN15-G1/2 " one end connect Φ 15 hose , one end is the interior whorl G1/2 ". | Specification of the hose | Tooth type whorl in DPN | Insert in NCJThe type is worthy of using the thick steel tube | | The metric system | British system | British system | Bao Gang | DNP | | φ12 | 3/8″ | G3/8″ | C19 | DNP3/8 | 3/8″ | | φ15（16） | 1/2″ | G1/2″ | C19 | DNP1/2 | 1/2″ | | φ20（19） | 3/4″ | G3/4″ | C25 | DNP3/4 | 3/4″ | | φ25 | 1″ | G1″ | C31 | DNP1 | 1″ | | φ32 | 1/1/4″ | G1/1/4″ | C39 | DNP1/1/4 | 1/1/4″ | | φ38（40） | 1/1/2″ | G1/1/2″ | C51 | DNP1/1/2 | 1/1/2″ | | φ51（50） | 2″ | G2″ | C63 | DNP2 | 2″ | | φ64（70） | 2/1/2″ | G2/1/2″ | C75 | DNP2/1/2 | 2/1/2″ | | φ75（80） | 3″ | G3″ | | DNP3 | 3″ | | φ100 | 4″ | G4″ | | DNP4 | 4″ | | φ125 | 5″ | G5″ | | DNP5 | 5″ | | φ150 | 6″ | G6″ | | DNP6 | 6″ | |
