The Valve,regulating,temperature, cataloged under National Stock Number 4820-00-891-3371, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hydraulics International, Inc. Dba Hydraulics International Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-891-3371 |
| Primary Part Number | 83003-204 |
| Item Name | Valve,regulating,temperature |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hydraulics International, Inc. Dba Hydraulics International Inc |
| Status | ACTIVE |
| Flow Control Device | BULB |
| First End Thread Direction | RIGHT-HAND |
| Second End Relationship with First End | IDENTICAL |
| Body Style | STRAIGHT THRU |
| First End Style Designator | PLAIN |
| Bulb Length | 9.625 INCHES NOMINAL IN |
| Bulb Diameter | 0.688 INCHES NOMINAL IN |
| Temp Rating | 400.0 FAHRENHEIT MAXIMUM DEGF |
| Criticality Code Justification | FEAT |
| End Connection Quantity | 2 |
| Capillary Tube Length | 96.000 INCHES NOMINAL IN |
| First End Connection Type | THREADED INTERNAL PIPE |
| Temp Adjustability | ADJUSTABLE |
| Thermostatic Element | LIQUID IMMERSION TYPE |
| Material | COPPER ALLOY BODY |
| Material | STEEL CORROSION RESISTING SEAT |
| Thread Size and Series/type Designator | 1-11-1/2 NPT FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 68A4C581 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 83003-204 PRIMARY | Hydraulics International, Inc. Dba Hydraulics International Inc (USA) |
| Reference | Meaning |
|---|---|
| 666H 0NEINCH100- | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 329-020 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-00-891-3371 is a Valve,regulating,temperature, manufactured by Hydraulics International, Inc. Dba Hydraulics International Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-891-3371 has 2 manufacturer part numbers on file: 68A4C581 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 83003-204 (Hydraulics International, Inc. Dba Hydraulics International Inc).
2 possible matches (shared part number, not a government interchangeability claim): 2805-01-219-8328, 2530-01-500-1722. Verify interchangeability with system specifications before substitution.
Key specifications for 83003-204: Flow Control Device: BULB; First End Thread Direction: RIGHT-HAND; Second End Relationship with First End: IDENTICAL; Body Style: STRAIGHT THRU. 17 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.