The Seat,valve, cataloged under National Stock Number 4820-01-173-4166, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Trac Regulator Co., Inc. Dba Trac Regulator Co Inc. Government technical data includes 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-173-4166 |
| Primary Part Number | 906-00 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| Status | ACTIVE |
| Body Outside Diameter | 1.500 INCHES NOMINAL IN |
| Material Document and Classification | ASTM B-150 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Material | COPPER ALLOY 632 SEAT |
| 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 |
|---|---|
| 906-00 PRIMARY | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 906 | 3/9 Design control — primary reference Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| 40401-09 PART 906 FIND 13 | 5/9 Secondary reference Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
NSN 4820-01-173-4166 is a Seat,valve, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-173-4166 has 1 manufacturer part number on file: 906-00 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5360-01-176-7905, 3655-01-463-8067, 6230-01-613-5125. Verify interchangeability with system specifications before substitution.
Key specifications for 906-00: Body Outside Diameter: 1.500 INCHES NOMINAL IN; Material Document and Classification: ASTM B-150 ASSN STD SINGLE MATERIAL RESPONSE SEAT; Material: COPPER ALLOY 632 SEAT. 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.