The Valve,air Venting,steam, cataloged under National Stock Number 4520-01-543-3084, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-543-3084 |
| Primary Part Number | 845-7108771-A1L1 |
| Item Name | Valve,air Venting,steam |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 845-7108771-A1L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 845-7108771-A1 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4520-01-543-3084 is a Valve,air Venting,steam, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-543-3084 has 1 manufacturer part number on file: 845-7108771-A1L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 845-7108771-A1L1: Criticality Code Justification: ZZZY; End Item Identification: VALVE,VENT CHECK; Reference Number Differentiating Characteristics: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS. 2 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.