The Seat,valve, cataloged under National Stock Number 4820-00-035-9660, 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 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-035-9660 |
| Primary Part Number | NAP704 PIECE 14 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.219 INCHES NOMINAL IN |
| Flange Diameter | 3.500 INCHES NOMINAL IN |
| Thread Length | 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Body Inside Diameter | 0.781 INCHES NOMINAL IN |
| Nominal Thread Size | 3.250 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 2.843 INCHES NOMINAL IN |
| Thread Class | 3A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 14 SINGLE THREADED PORTION |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| NAP704 PIECE 14 | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| P1501A-00 | Trac Regulator Co., Inc. Dba Trac Regulator Co Inc (USA) |
| Reference | Meaning |
|---|---|
| NAP704 PIECE 14 | 5/9 Secondary reference Atlas Valve Co |
| NAP704 | D/9 Drawing number reference only Atlas Valve Co |
| P1501A | 3/9 Design control — primary reference Trac Regulator Co., Inc. Dba Trac Regulator Co Inc |
| P1501A | 5/9 Secondary reference Atlas Valve Co |
NSN 4820-00-035-9660 is a Seat,valve, manufactured by Trac Regulator Co., Inc. Dba Trac Regulator Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-035-9660 has 2 manufacturer part numbers on file: NAP704 PIECE 14 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc), P1501A-00 (Trac Regulator Co., Inc. Dba Trac Regulator Co Inc).
3 possible matches (shared part number, not a government interchangeability claim): 3040-01-412-1701, 4820-01-412-2652, 4820-01-413-4054. Verify interchangeability with system specifications before substitution.
Key specifications for NAP704 PIECE 14: Flange Seat to Disk End Height: 0.219 INCHES NOMINAL IN; Flange Diameter: 3.500 INCHES NOMINAL IN; Thread Length: 0.500 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 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.