The Cap Assembly,protective,muffler-, cataloged under National Stock Number 2990-01-465-9173, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Gt Exhaust Systems 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 2990-01-465-9173 |
| Primary Part Number | 22-600 |
| Item Name | Cap Assembly,protective,muffler- |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Gt Exhaust Systems Inc |
| Status | ACTIVE |
| Pipe Diameter Range Accommodated | +5.750 TO 6.250 INCHES IN |
| Pipe Outside Diameter Accommodated | 6.000 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 |
|---|---|
| 22-600 PRIMARY | Gt Exhaust Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 9167828 | D/9 Drawing number reference only U.S. Government activity |
| 9167828-1 | 5/9 Secondary reference U.S. Government activity |
NSN 2990-01-465-9173 is a Cap Assembly,protective,muffler-, manufactured by Gt Exhaust Systems Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-465-9173 has 1 manufacturer part number on file: 22-600 (Gt Exhaust Systems Inc).
1 possible match (shared part number, not a government interchangeability claim): 5120-01-503-4770. Verify interchangeability with system specifications before substitution.
Key specifications for 22-600: Pipe Diameter Range Accommodated: +5.750 TO 6.250 INCHES IN; Pipe Outside Diameter Accommodated: 6.000 INCHES IN; Special Features: STAINLESS STEEL BUSHING AND HINGE ASSY; COUNTER BALANCED FOR AUTOMATIC OPERATION; AMBIENT OPERATING RANGE FROM -40 DEG F TO +115 DEG F; NEXT HIGHER ASSY/NSN 4130-01-446-3526; COMPRESSOR, REFRIGERATION DEGF; End Item Identification: B-1 SUPPORT EQUIPMENT. 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.