The Hose Assembly,air Breathing, cataloged under National Stock Number 4720-01-573-2423, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-573-2423 |
| Item Name | Hose Assembly,air Breathing |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Status | ACTIVE |
| Measuring Method and Length | 240.000 INCHES NOMINAL EXCLUDING END FITTINGS IN |
| Connection Type | THREADED BOTH ENDS |
| Inside Diameter | 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM BOTH ENDS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| M26626-5-240 | 2/2 Government specification standardization U.S. Government activity |
| MIL-PRF-26626 | 4/1 Identification reference U.S. Government activity |
| MIL-PRF-26626F-5-240 | 5/9 Secondary reference U.S. Government activity |
NSN 4720-01-573-2423 is a Hose Assembly,air Breathing, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
Key specifications for 4720-01-573-2423: Measuring Method and Length: 240.000 INCHES NOMINAL EXCLUDING END FITTINGS IN; Connection Type: THREADED BOTH ENDS; Inside Diameter: 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM BOTH ENDS IN; Special Features: OD RIGID TUBING INSERT 5/16";MIN DIA .193";DIA +.005 -.000, .355";INNER WALL LINER +.007 -.005, .040";END FITTING AN818; BURST TEST PRESSURE: 2200.0 PSI; CONNECTION STYLE: NUT ASSEMBLY WITH INVERTED FLARE AND GASKET ALL ENDS; MEDIA FOR WHICH DESIGNED: NITROGEN, LIQUID 1ST RESPONSE OXYGEN, LIQUID 2ND RESPONSE; OUTSIDE DIAMETER: 0.359 IN. MIN. AND 0.406 IN. MAX. IN. 3 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.