The Cap Assembly,protective,muffler-, cataloged under National Stock Number 2990-00-377-1558, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Mercury Products Corp. Government technical data includes 2 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-377-1558 |
| Primary Part Number | SIZE2 |
| Item Name | Cap Assembly,protective,muffler- |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Mercury Products Corp |
| Status | ACTIVE |
| Pipe Outside Diameter Accommodated | 2.500 INCHES IN |
| Material | STEEL |
| 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 |
|---|---|
| SIZE2 PRIMARY | Mercury Products Corp (USA) |
| 71A5016A0058 | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service (USA) |
NSN 2990-00-377-1558 is a Cap Assembly,protective,muffler-, manufactured by Mercury Products Corp, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-377-1558 has 2 manufacturer part numbers on file: SIZE2 (Mercury Products Corp), 71A5016A0058 (Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service).
1 possible match (shared part number, not a government interchangeability claim): 3010-01-191-4461. Verify interchangeability with system specifications before substitution.
Key specifications for SIZE2: Pipe Outside Diameter Accommodated: 2.500 INCHES IN; Material: STEEL. 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.