The Valve,air,emission Control, cataloged under National Stock Number 2990-01-588-1222, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Mcmaster-Carr Supply Co. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-588-1222 |
| Primary Part Number | 9891K21 |
| Item Name | Valve,air,emission Control |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| 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 |
|---|---|
| 9891K21 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 9891K21 | 3/9 Design control — primary reference Mcmaster Carr Supply Co |
NSN 2990-01-588-1222 is a Valve,air,emission Control, manufactured by Mcmaster-Carr Supply Co, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-588-1222 has 1 manufacturer part number on file: 9891K21 (Mcmaster-Carr Supply Co).
Key specifications for 9891K21: Special Features: MISC PARTS ELECTRICAL FOR LSD 0042; BRASS BODY AND POLYURTHANE BOWL; MANUAL DRAIN; PLYPROPALENE ELEMENT; 9.6 IN HIGH; 2.68 IN WIDE; 150 PSI; RANGE 5 TO 150 PSI IN; Part Name Assigned by Controlling Agency: AIR FILTER, REGULATOR; End Item Identification: LSD 0042. 0 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.