The Valve,check, cataloged under National Stock Number 4820-01-553-4600, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Tescom Corp Dba Tescom Div Tescom. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-553-4600 |
| Primary Part Number | 30-1111-XXX |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Tescom Corp Dba Tescom Div Tescom |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 7550478-DES-021704-13 | Naval Sea Systems Command (USA) |
| 30-1111-XXX PRIMARY | Tescom Corp Dba Tescom Div Tescom (USA) |
| Reference | Meaning |
|---|---|
| 7550478 | D/9 Drawing number reference only Naval Sea Systems Command |
| G547-0002-DES-021704-13 | 5/2 Secondary reference U.S. Government activity |
| DES-021704 ITEM 13 | 5/2 Secondary reference U.S. Government activity |
| DES-021704-13 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-553-4600 is a Valve,check, manufactured by Tescom Corp Dba Tescom Div Tescom, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-553-4600 has 2 manufacturer part numbers on file: 7550478-DES-021704-13 (Naval Sea Systems Command), 30-1111-XXX (Tescom Corp Dba Tescom Div Tescom).
4 possible matches (shared part number, not a government interchangeability claim): 4820-01-553-4606, 6685-01-554-8812, 6685-01-554-8821. Verify interchangeability with system specifications before substitution.
Key specifications for 30-1111-XXX: Special Features: HAND VALVE FOR A CO2 MONITORING KIT; 9/16-18 SAE INLET; 1/4-18 SAE INLET; Part Name Assigned by Controlling Agency: VALVE HAND; End Item Identification: SSGN TRIDENT CONVERSION. 0 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.